feat: add a file discovery package

[james-snyk]

• Tests written and linted ℹ︎
• Documentation written ℹ︎
• Commit history is tidy ℹ︎

What this does

New discovery package provides efficient, flexible file discovery utilities for finding manifest and configuration files across directory trees.

Features

• Multiple search modes: Find specific files by path OR match glob patterns OR combine both
• Exclude patterns: Skip directories/files with glob patterns (e.g., node_modules, .venv)
• Smart behavior:
  • Target files are path-specific (not recursive)
  • Include globs search recursively
  • Automatic deduplication when criteria overlap
  • Errors when target file not found
• Context support: Cancellable operations for large directory traversals

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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[37IulianPopovici]

Can you also please remove docs about symlink?