feat: add Oxlint linter integration

[fsargent]

What?

Add an Oxlint integration for JavaScript, TypeScript, JSX, and TSX:

• Run Oxlint with SARIF output for diagnostics.
• Run Oxfmt as the formatter.
• Recognize the documented Oxlint and Oxfmt configuration files.
• Track configuration inputs that affect lint and format results.
• Add lint and format integration tests with pinned-version snapshots.
• Document Oxlint in the supported-linters list.

Why?

Oxlint and Oxfmt provide fast, dedicated linting and formatting with strong ESLint and Prettier compatibility. This integration installs both tools hermetically and follows their current configuration and CLI conventions.

Validation

• npm test -- linters/oxlint
• PLUGINS_TEST_LINTER_VERSION=KnownGoodVersion npm test -- linters/oxlint
• npm test -- tests/repo_tests/config_check.test.ts --runInBand
• npm test -- tests/repo_tests (Graphite submit hook)
• trunk check ... on all changed source files
• Snyk Code scan: no findings