feat: add gblob scheme support for extension

[monkeyWie]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 57.35476% with 345 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.51%. Comparing base (ae70dc2) to head (4f00073).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/protocol/gblob/fetcher.go	53.71%	85 Missing and 21 partials ⚠️
internal/protocol/gblob/registry.go	58.91%	76 Missing and 30 partials ⚠️
pkg/download/extmock.go	0.00%	51 Missing ⚠️
pkg/download/engine/inject/stream/module.go	27.45%	26 Missing and 11 partials ⚠️
pkg/download/downloader.go	81.18%	11 Missing and 8 partials ⚠️
pkg/download/extension_engine_session.go	79.45%	13 Missing and 2 partials ⚠️
pkg/download/engine/engine.go	76.31%	6 Missing and 3 partials ⚠️
pkg/download/extension.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1358      +/-   ##
==========================================
- Coverage   71.27%   69.51%   -1.77%     
==========================================
  Files          49       54       +5     
  Lines        6566     7272     +706     
==========================================
+ Hits         4680     5055     +375     
- Misses       1458     1720     +262     
- Partials      428      497      +69     

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