feat: support h2c over unix domain sockets

[chrros95]

This relates to...

Closes #4689

Rationale

With this pull request the custom connect behaviour of the H2CClient is replaced by the logic of the (h1) Client.

Changes

• Replace parent class (DispatcherBase) of H2CClient with the Client
• add useH2c parameter to Client and buildConnector to enable h2c on the socket

Features

n/a

Bug Fixes

• request with socketPath parameter are now completed successfully.

Breaking Changes and Deprecations

n/a

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• [S] Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.84%. Comparing base (5024d1b) to head (68edce2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4690   +/-   ##
=======================================
  Coverage   92.83%   92.84%           
=======================================
  Files         107      107           
  Lines       33515    33455   -60     
=======================================
- Hits        31115    31062   -53     
+ Misses       2400     2393    -7     

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[metcoder95]

Good work! I believe we can eventually get rid of the H2C client and embed it into the Client itself.

Errors are not related with the PR

[mcollina]

lgtm