refactor(core-utils): inline parse-author and drop dependency

[MarshallOfSound]

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• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

This PR inlines the parse-author package directly into the codebase, eliminating an external dependency. The implementation is based on the original parse-author and author-regex libraries by Jon Schlinkert, with proper attribution included.

Changes:

• Implemented parseAuthor() function in packages/utils/core-utils/src/author-name.ts with full support for parsing author strings in the format: Name <email> (url)
• Added comprehensive unit tests covering all parsing scenarios: name only, name with email, name with email and url, name with url, email only, url only, empty strings, and error handling
• Removed the parse-author dependency from packages/utils/core-utils/package.json
• Removed the TypeScript type definition file for the external package

The new implementation maintains backward compatibility with the existing getNameFromAuthor() function while providing a more maintainable solution with no external dependencies.

Test Plan:

Added 10 new unit tests in packages/utils/core-utils/spec/author-name.spec.ts that verify:

• Correct parsing of all author string formats
• Proper handling of edge cases (empty strings, whitespace)
• Type validation (throws TypeError for non-string input)

All existing tests continue to pass.

https://preview.claude.ai/code/session_01NRnc7rtSszgHHv5XgXVyjm