Run rustfmt in CI (#15217)

I considered running clippy as well but ort takes too long to build

.github/workflows/lint.yml

@@ -40,6 +40,11 @@ jobs:
         with:
           # Version range or exact version of Python to use, using SemVer's version range syntax. Reads from .python-version if unset.
           python-version: "3.10"
+      - name: Setup Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          components: rustfmt
       - name: Install dependencies
         run: |
           python -m pip install -r requirements-dev.txt

.lintrunner.toml

@@ -152,3 +152,19 @@ init_command = [
     '--dry-run={{DRYRUN}}',
     'pylint==2.15.5',
 ]
+
+[[linter]]
+code = 'RUSTFMT'
+include_patterns = ['**/*.rs']
+command = [
+    'python',
+    '-m',
+    'lintrunner_adapters',
+    'run',
+    'rustfmt_linter',
+    '--binary=rustfmt',
+    '--config-path=rust/rustfmt.toml',
+    '--',
+    '@{{PATHSFILE}}'
+]
+is_formatter = true