feat(http): stabilize ServerSentEventParseStream

[tomas-zijdemans]

I made the mistake of naming the file unstable_server_sent_event_stream.ts here. That should have been unstable_server_sent_event_parse_stream.ts . I was probably thinking that both the parser and serializer should be in the same file (but that's not following the encoder/decoder and stringify/parse convention in std).

Ideally server_sent_event_stream.ts would be renamed server_sent_event_stringify_stream.ts, but it's been stabilized. So I guess we are stuck with that name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.36%. Comparing base (6df7f21) to head (b5077a1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7050      +/-   ##
==========================================
+ Coverage   94.01%   94.36%   +0.34%     
==========================================
  Files         627      627              
  Lines       50029    50034       +5     
  Branches     8807     8809       +2     
==========================================
+ Hits        47037    47216     +179     
+ Misses       2413     2251     -162     
+ Partials      579      567      -12     

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