Add search action to getSourceCode tool for searching original TypeScript sources

[InDate]

Feature Request

Add a search action to the getSourceCode tool that:

1. Searches original TypeScript/source files via sourcemaps (not compiled JS)
2. Returns precise file:line:column locations
3. Auto-discovers sourcemaps from common build directories (build, dist, out, .next, lib)
4. Falls back to reading original sources from disk when sourcesContent is not embedded
5. Supports regex patterns, case sensitivity, and URL filtering

This enables effective code search during debugging of both Node.js and web applications.

Usage

getSourceCode({ action: 'search', pattern: 'interface.*Handler', urlFilter: 'src/' })