protogen: add option PreserveFieldNumbers to support field's Tag Number compatibility

[Kybxd]

• close protogen: guarantee message field's Tag Number compatibility #218
• close protogen: add field number prop #230

[codecov]

Codecov Report

❌ Patch coverage is 85.13514% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.10%. Comparing base (fe37408) to head (d67f66c).

Files with missing lines	Patch %	Lines
internal/protogen/exporter.go	90.62%	1 Missing and 5 partials ⚠️
internal/protogen/protogen.go	50.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
+ Coverage   74.02%   74.10%   +0.08%     
==========================================
  Files          87       87              
  Lines        8599     8653      +54     
==========================================
+ Hits         6365     6412      +47     
- Misses       1685     1690       +5     
- Partials      549      551       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.