fix(ws): Fix JSON decode error on invalid commands

[msbrogli]

Motivation

Fix an unhandled exception when a websocket command was malformed.

Acceptance Criteria

1. Send a WebsocketErrorMessage when a command is malformed.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	fix/ws-json-decode-error
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.52 (-8.00%)	1.48 (97.82%)	1.81 (83.64%)

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[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.02%. Comparing base (508030c) to head (90fddc7).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/websocket/protocol.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1202      +/-   ##
==========================================
+ Coverage   84.91%   85.02%   +0.11%     
==========================================
  Files         323      323              
  Lines       25124    25133       +9     
  Branches     3859     3859              
==========================================
+ Hits        21334    21370      +36     
+ Misses       3042     3028      -14     
+ Partials      748      735      -13     

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