Fix not clean stopping

[wasilukm]

hoymiles-mqtt was not stopping cleanly, many threads were left forever and consuming CPU power. Support for system signals was introduced for graceful process termination.
Additionally, logging was reworked to not log events from sub-dependencies (they were spamming logs).

Fixes #33

[codecov]

Codecov Report

Attention: Patch coverage is 18.33333% with 49 lines in your changes missing coverage. Please review.

Project coverage is 73.26%. Comparing base (ca10b3d) to head (7d9599f).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
hoymiles_mqtt/runners.py	5.76%	48 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
- Coverage   76.53%   73.26%   -3.28%     
==========================================
  Files           5        5              
  Lines         277      288      +11     
  Branches       45       45              
==========================================
- Hits          212      211       -1     
- Misses         56       67      +11     
- Partials        9       10       +1     

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