improve websocket error reporting

[graebm]

• Add new error AWS_ERROR_HTTP_WEBSOCKET_PROTOCOL_ERROR
  • previously, websocket was using AWS_ERROR_HTTP_PROTOCOL_ERROR, which makes it look like an HTTP protocol error
• Add logging for errors from websocket encoder & decoder
• Remove some TODOs that have been taken care of

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Base: 79.32% // Head: 79.44% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (cc09b58) compared to base (50201a7).
Patch coverage: 91.30% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   79.32%   79.44%   +0.11%     
==========================================
  Files          27       27              
  Lines       11881    11897      +16     
==========================================
+ Hits         9425     9451      +26     
+ Misses       2456     2446      -10     

Impacted Files	Coverage Δ
source/http.c	53.19% <ø> (ø)
source/websocket.c	81.99% <ø> (ø)
source/websocket_encoder.c	94.23% <80.00%> (-0.98%)	⬇️
source/websocket_decoder.c	100.00% <100.00%> (+1.58%)	⬆️
source/h2_connection.c	83.75% <0.00%> (+0.76%)	⬆️

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