feat(workspace-plugin): support export maps in generate-api executor

[Hotell]

Summary

Adds support for package.json exports map (sub-path and wildcard entries) in the generate-api executor, enabling packages like @fluentui/react-headless-components-preview to generate per-entry API reports and .d.ts rollups.

Changes

• react-headless-components: Add sub-path imports support via package.json exports map
• generate-api executor: Expand wildcard typed exports (e.g. ./*) into individual api-extractor runs, producing per-directory .d.ts rollups and API reports under /etc
• generate-api executor: Make enableWildcardExpansion a configurable schema flag (defaults to true)
• Refactor: Remove hard-coded src/components coupling — derive paths generically from declarationBase and the types pattern
• Refactor: Extract small named functions (resolveDeclarationBase, parseWildcardTypesPattern, listSubDirectories, createWildcardEntryConfig, resolveConfigSource)
• Refactor: Deduplicate isWildcardTypedEntry into shared utils.ts
• Workspace plugin: Simplify buildGenerateApiTarget — use broad glob outputs (dist/**/*.d.ts, etc/*.api.md) when additional configs or wildcard exports exist
• Tests: Add focused test cases for generate-api target input/output configuration

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