feat: OSV-Scanner MCP server

[another-rex]

A rough draft of a MCP server for osv-scanner.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 2.73224% with 178 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.04%. Comparing base (de3fd42) to head (e4e83b6).

Files with missing lines	Patch %	Lines
cmd/osv-scanner/mcp/main.go	0.00%	120 Missing ⚠️
internal/output/mcp.go	0.00%	41 Missing ⚠️
cmd/osv-scanner/mcp/stats.go	0.00%	13 Missing ⚠️
pkg/osvscanner/scan.go	57.14%	1 Missing and 2 partials ⚠️
cmd/osv-scanner/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              mcp    #2256      +/-   ##
==========================================
- Coverage   67.46%   67.04%   -0.42%     
==========================================
  Files         169      172       +3     
  Lines       16386    16491     +105     
==========================================
+ Hits        11055    11057       +2     
- Misses       4655     4756     +101     
- Partials      676      678       +2     

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[another-rex]

/gemini