Fix netty 'unknown' transactions

[obenkenobi]

Overview

The default start point for starting netty HTTP2 transactions were reverted to use io.netty.handler.codec.http2.Http2FrameCodec. This will stop the 'unknown' http2 transactions at a loss possible coverage of http2 requests in niche scenarios. To add such granularity at the cost of possibly receiving 'unknown', a new feature flag is added via the config:

common: &default_settings
...
  netty:
    http2:
      frame_read_listener:
        start_transaction: true

Related Github Issue

#2106

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.54%. Comparing base (0f181db) to head (7cd6ef4).
Report is 34 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2274      +/-   ##
============================================
- Coverage     70.60%   70.54%   -0.06%     
- Complexity     9995    10022      +27     
============================================
  Files           843      844       +1     
  Lines         40453    40569     +116     
  Branches       6130     6148      +18     
============================================
+ Hits          28562    28620      +58     
- Misses         9112     9168      +56     
- Partials       2779     2781       +2     

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