Resolve "Websocket error propagation lacks usability"

[btschwertfeger]

Summary

• Adding an enum that communicates the websocket connection states
• Fix typo

Closes #352

[codecov]

Codecov Report

Attention: Patch coverage is 77.46479% with 16 lines in your changes missing coverage. Please review.

Project coverage is 87.47%. Comparing base (cdacfc6) to head (fffaaa7).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/kraken/spot/websocket/connectors.py	70.83%	7 Missing ⚠️
src/kraken/futures/websocket/__init__.py	70.00%	6 Missing ⚠️
src/kraken/spot/websocket/__init__.py	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
- Coverage   87.49%   87.47%   -0.02%     
==========================================
  Files          22       22              
  Lines        1935     1972      +37     
==========================================
+ Hits         1693     1725      +32     
- Misses        242      247       +5     

Flag	Coverage Δ
unittests	87.47% <77.46%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/kraken/spot/funding.py	45.83% <ø> (ø)
src/kraken/utils/utils.py	91.30% <100.00%> (+6.68%)	⬆️
src/kraken/spot/websocket/__init__.py	88.88% <82.35%> (-2.03%)	⬇️
src/kraken/futures/websocket/__init__.py	84.61% <70.00%> (+0.22%)	⬆️
src/kraken/spot/websocket/connectors.py	87.15% <70.83%> (+0.09%)	⬆️

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