refactor: Move other modules into new namespaces

[bagel897]

• move gsbuild
• move codegen.git
• remove agents code
• update imports
• move gscli and gsbuild

[codecov]

Codecov Report

Attention: Patch coverage is 62.85714% with 65 lines in your changes missing coverage. Please review.

Project coverage is 73.98%. Comparing base (c6e5c0e) to head (3f6befb).
Report is 5 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/graph_sitter/cli/cli.py	0.00%	43 Missing ⚠️
...aph_sitter/code_generation/codegen_sdk_codebase.py	0.00%	8 Missing ⚠️
src/graph_sitter/cli/sdk/function.py	0.00%	5 Missing ⚠️
src/graph_sitter/cli/sdk/functions.py	0.00%	5 Missing ⚠️
src/graph_sitter/cli/sdk/pull_request.py	0.00%	3 Missing ⚠️
src/graph_sitter/core/interfaces/editable.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #23      +/-   ##
===========================================
+ Coverage    73.62%   73.98%   +0.36%     
===========================================
  Files          438      423      -15     
  Lines        22970    22282     -688     
===========================================
- Hits         16911    16486     -425     
+ Misses        6059     5796     -263     

Flag	Coverage Δ
unit-tests	73.98% <62.85%> (+0.36%)	⬆️

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[github-actions]

🎉 This PR is included in version 0.56.2 🎉

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