feat: new search_npm_packages MCP tool

[flaviodelgrosso]

This pull request introduces a new feature for searching npm packages, along with updates to the project configuration and dependencies. The changes include implementing a new tool for npm package search.

Closes #53

New MCP Tool search_npm_packages

• Added a new tool to search for npm packages using the npm-registry-sdk, with support for filtering by qualifiers like author, scope and keywords.
• Integrated the searchNpmPackages tool into the server in src/server.ts and updated server metadata to dynamically load the name, version and description from package.json.

Dependency Updates

• Added npm-registry-sdk as a new dependency in package.json.
• Updated @vitest/coverage-v8 and moved vitest to dev dependencies.

Testing

• Added tests for the searchNpmPackages functionality in test/searchNpmPackages.test.ts. Tests cover successful searches, handling of no results, use of qualifiers, missing package details and error scenarios.

Chore Updates

• Fixed lint-staged and husky configurations on pre-commit hook

[alfonsograziano]

Hey @flaviodelgrosso this sounds like a nice addition! In case you finalize this please let me know, happy to release this new feature in the next release :D

[alfonsograziano]

Thanks a lot @flaviodelgrosso LGTM. Cannot wait to try it out!