### Description
<!-- Describe your changes. -->
Update various test projects to .net8 from EOL frameworks.
Replace the Xamarin based Android and iOS test projects with a MAUI
based project that uses .net 8.
Add new CoreML flags to C# bindings
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Remove usage of EOL frameworks.
Bumps [Sixlabors.ImageSharp](https://github.com/SixLabors/ImageSharp)
from 2.1.8 to 2.1.9.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/SixLabors/ImageSharp/releases">Sixlabors.ImageSharp's
releases</a>.</em></p>
<blockquote>
<h2>v2.1.9</h2>
<h2>What's Changed</h2>
<ul>
<li>[2.1] Fix overflow in MemoryAllocator.Create(options) by <a
href="https://github.com/antonfirsov"><code>@antonfirsov</code></a> in
<a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2732">SixLabors/ImageSharp#2732</a></li>
<li>Backport GIF LZW fix to 2.1 by <a
href="https://github.com/antonfirsov"><code>@antonfirsov</code></a> in
<a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2756">SixLabors/ImageSharp#2756</a></li>
<li>Backport 2759 to 2.1.x by <a
href="https://github.com/antonfirsov"><code>@antonfirsov</code></a> in
<a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2770">SixLabors/ImageSharp#2770</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/SixLabors/ImageSharp/compare/v2.1.8...v2.1.9">https://github.com/SixLabors/ImageSharp/compare/v2.1.8...v2.1.9</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="9816ca4501"><code>9816ca4</code></a>
Merge pull request <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2770">#2770</a>
from SixLabors/af/backport-2759-2.1.x</li>
<li><a
href="b33d666ab7"><code>b33d666</code></a>
handle DecodingMode</li>
<li><a
href="6b2030b549"><code>6b2030b</code></a>
Merge branch 'release/2.1.x' into af/backport-2759-2.1.x</li>
<li><a
href="8ffad3f480"><code>8ffad3f</code></a>
Issue2012BadMinCode should decode now</li>
<li><a
href="1f5bf23b9e"><code>1f5bf23</code></a>
skip Issue2758_DecodeWorks</li>
<li><a
href="3bf8c572a0"><code>3bf8c57</code></a>
manual port of 3.1 gif decoder</li>
<li><a
href="28c20ded87"><code>28c20de</code></a>
Clamp JPEG quality estimation results.</li>
<li><a
href="4b910e7f84"><code>4b910e7</code></a>
Decode LZW row by row</li>
<li><a
href="a1f2879771"><code>a1f2879</code></a>
Merge pull request <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2756">#2756</a>
from SixLabors/af/git-av-2.1</li>
<li><a
href="898df7f8ca"><code>898df7f</code></a>
backport <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2749">#2749</a>
to 2.1</li>
<li>Additional commits viewable in <a
href="https://github.com/SixLabors/ImageSharp/compare/v2.1.8...v2.1.9">compare
view</a></li>
</ul>
</details>
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[](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)
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Bumps [Sixlabors.ImageSharp](https://github.com/SixLabors/ImageSharp)
from 2.1.7 to 2.1.8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/SixLabors/ImageSharp/releases">Sixlabors.ImageSharp's
releases</a>.</em></p>
<blockquote>
<h2>v2.1.8</h2>
<h2>What's Changed</h2>
<ul>
<li>V2 - Limit Read Palette Indices by <a
href="https://github.com/JimBobSquarePants"><code>@JimBobSquarePants</code></a>
in <a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2719">SixLabors/ImageSharp#2719</a></li>
<li>V2 - Clear Pixel Buffers on Decode. by <a
href="https://github.com/JimBobSquarePants"><code>@JimBobSquarePants</code></a>
in <a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2717">SixLabors/ImageSharp#2717</a></li>
<li>V2 - Limit all memory allocations in the MemoryAllocator layer by <a
href="https://github.com/JimBobSquarePants"><code>@JimBobSquarePants</code></a>
in <a
href="https://redirect.github.com/SixLabors/ImageSharp/pull/2715">SixLabors/ImageSharp#2715</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/SixLabors/ImageSharp/compare/v2.1.7...v2.1.8">https://github.com/SixLabors/ImageSharp/compare/v2.1.7...v2.1.8</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="f21d64188e"><code>f21d641</code></a>
Merge pull request <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2715">#2715</a>
from SixLabors/backport/v2-memlimit</li>
<li><a
href="8f0b4d3e68"><code>8f0b4d3</code></a>
Merge pull request <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2717">#2717</a>
from SixLabors/backport/v2-clear-buffers</li>
<li><a
href="cf9496d284"><code>cf9496d</code></a>
test allocation limits</li>
<li><a
href="3d298db2cd"><code>3d298db</code></a>
Adapt BmpDecoder_ThrowsException_Issue2696 for V2</li>
<li><a
href="a78ce27a2b"><code>a78ce27</code></a>
Merge pull request <a
href="https://redirect.github.com/SixLabors/ImageSharp/issues/2719">#2719</a>
from SixLabors/backport/v2-check-palette-indices</li>
<li><a
href="e6209147b1"><code>e620914</code></a>
Clamp read palette indices.</li>
<li><a
href="c122185ea0"><code>c122185</code></a>
Clear pixel buffers on decode.</li>
<li><a
href="5c6ec5d6fb"><code>5c6ec5d</code></a>
Limit all allocations</li>
<li>See full diff in <a
href="https://github.com/SixLabors/ImageSharp/compare/v2.1.7...v2.1.8">compare
view</a></li>
</ul>
</details>
<br />
[](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)
Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
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Add Xamarin support to the ORT nuget packages.
- Update C# code to support Xamarin builds for iOS and Android
- refactor some things to split out common code
- include iOS and Android ORT native shared library in native nuget package
