### Description
Bump spotless and the Gradle wrapper to 6.25.0 and 8.6 respectively to
allow compiling ORT on Java 21. The build still targets Java 8.
I'm not sure if there will be CI changes necessary to use this PR,
specifically for the Gradle version as I don't know if that is cached
somewhere earlier in the CI build process.
The new Gradle version adds a warning that using `--source` and
`--target` to select the Java language version is obsolete which is
annoying, we can fix it if we decide to only allow building on newer
versions of Java, while still supporting running on Java 8.
### Motivation and Context
Java 21 is the latest LTS release of Java and ORT should be able to
build on it.
- Update Gradle version used in most places from 6.8.3 to 8.0.1. Update Android Gradle Plugin version where applicable.
Not updated in this change: React Native Android projects (under `js/react_native/`). That can be done later along with updating the React Native projects.
- Add Gradle wrapper in `java/` to make it easier to consistently use a specific Gradle version.
* update java API docs
* fix link
* rearrange
* update platforms, use table
* use javadoc.io
* craigacp tested it in java 14
* update link
* fix broken link
* fix testdata link
* Initial update of readme
* Readme updates
* Review of consolidated README (#3930)
* Proposed updates for readme (#3953)
I found some of the information was duplicated within the doc, so attempted to streamline
* Fix links
* More updates
- fix build instructions
- nodejs doc reorganization
- roadmap update
- version fixes
* Update ORT Server build instructions
* More doc cleanup
* fix python dev notes name
* Update nodejs and some links
* sync eigen version back to master
* Minor fixes
* add nodsjs to sample table of content
* Update README.md
* Update README.md
* Update README.md
* Update README.md
* Update README.md
* Update README.md
* address PR feedback
* address PR feedback
* nodejs build instruction
* Update Java instructions to include gradle
* Roadmap refresh
Reformat some data, fix link, minor rewording
* Clarify Visual C++ runtime req
Co-authored-by: Nat Kershaw (MSFT) <nakersha@microsoft.com>
Co-authored-by: Prasanth Pulavarthi <prasantp@microsoft.com>
Co-authored-by: manashgoswami <magoswam@microsoft.com>
