Allow multiple chargers per cs

[drc38]

@lbbrhzn still a bit of work but appreciate your views on the draft

[codecov]

Codecov Report

Attention: Patch coverage is 96.09375% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.95%. Comparing base (76287e5) to head (45980bb).

Files with missing lines	Patch %	Lines
custom_components/ocpp/api.py	95.45%	2 Missing ⚠️
custom_components/ocpp/config_flow.py	90.47%	2 Missing ⚠️
custom_components/ocpp/chargepoint.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1480      +/-   ##
==========================================
- Coverage   94.69%   89.95%   -4.74%     
==========================================
  Files          12       12              
  Lines        1943     1982      +39     
==========================================
- Hits         1840     1783      -57     
- Misses        103      199      +96     

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