go generate support for oss/public modules

[dengsh12]

Proposed changes

We plan to provide a tool to update supporting files(analyze_*_directives.go) by go generate. This MR is to provide go generate update for oss and public modules(oss/lua/otel//njs/headersmore).

go generate only targets for dynamic modules(or OSS, NPlus) we want to provide long-lasting supports for. To provide temporary support for a module, please refer to #101

Here are the detailed changes:

• Add a shell script(./scripts/public_source_gen.sh) to fetch code from github and generate corresponding support files. It would make adding new dynamic modules or updating current existing support files easy.
• Add .gen.go suffix to generated files and ignore them in golangci-lint
• Add go:generate comments for oss and public modules in analyze.go
• ./cmd/generate can read from json file now
• Renaming of MatchFunc and directives map in .gen.go files.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

[codecov]

Codecov Report

Attention: Patch coverage is 19.04762% with 68 lines in your changes missing coverage. Please review.

Project coverage is 76.57%. Comparing base (82990a0) to head (7873352).
Report is 6 commits behind head on main.

Files	Patch %	Lines
cmd/generate/main.go	0.00%	46 Missing ⚠️
internal/generator/generator.go	0.00%	9 Missing ⚠️
analyze_oss_124_directives.gen.go	0.00%	3 Missing ⚠️
analyze_oss_126_directives.gen.go	0.00%	3 Missing ⚠️
analyze_otel_directives.gen.go	0.00%	3 Missing ⚠️
analyze_nplus_R30_directives.go	0.00%	2 Missing ⚠️
analyze_nplus_R31_directives.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   78.82%   76.57%   -2.26%     
==========================================
  Files          26       26              
  Lines        1124     1161      +37     
==========================================
+ Hits          886      889       +3     
- Misses        182      216      +34     
  Partials       56       56              

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