Remove use_metric_units parameter

[rikroe]

Breaking change

Removes the defunct use_metric_units parameter. The BMW API returns only metric values since 2022 anyways.

Proposed change

Remove parameter and don't confuse users with imperial units while the actual numbers are in metric units.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes use_metric_units=False has no impact #581
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c0526c6) 100.00% compared to head (b348345) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #584   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines         1404      1403    -1     
=========================================
- Hits          1404      1403    -1     

Flag	Coverage Δ
3.10	100.00% <100.00%> (ø)
3.11	100.00% <100.00%> (ø)
3.12	100.00% <100.00%> (ø)
3.8	100.00% <100.00%> (ø)
3.9	100.00% <100.00%> (ø)

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[gerard33]

LGTM