feat(fmt): add ignore patterns matcher

[chenjiahan]

This PR adds a reusable in-memory matcher for define.fmt.ignorePatterns so discovered and explicitly passed files share the same gitignore-compatible filtering.

It uses fast-ignore@2.0.0 as a bundled dev dependency, compiles each config's ordered patterns once, and resolves file paths from the Rstack config root

Related Links

• https://github.com/prettier/prettier-cli/blob/0a66ef56a70a9bd29a44f3400f5cc7fbfa875341/src/config_ignore.ts

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📥 Commits

Reviewing files that changed from the base of the PR and between 06d4704 and 57db227.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (5)

• packages/rstack/THIRD_PARTY_NOTICES.md
• packages/rstack/package.json
• packages/rstack/src/fmt/ignore.ts
• packages/rstack/tests/fmt/ignore.test.ts
• pnpm-workspace.yaml

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