feat(jsx-renderer): set Content-Encoding when stream is true

[yusukebe]

With this PR, if the stream is true, it will set Content-Encoding as Identity. This is needed to correct the behavior of Suspense when the content is encoded like gzip.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.76%. Comparing base (bdaaa7f) to head (d39bb4d).
Report is 9 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff            @@
##             next    #3355    +/-   ##
========================================
  Coverage   95.76%   95.76%            
========================================
  Files         151      151            
  Lines        9186     9187     +1     
  Branches     2708     2817   +109     
========================================
+ Hits         8797     8798     +1     
  Misses        389      389            

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