Refactor vehicle init

[rikroe]

Proposed change

Refactor the way we get vehicle data a bit, hopefully to make it clearer and less of an effort to add additional endpoints.

• Only get base vehicle information in account.py
• Get vehicle state and further information in vehicle.py
• Adjust methods to initialize MyBMWVehicle

Based on #591 so that should be merged first.

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 #
• 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 (5d78330) 100.00% compared to head (6ce2869) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #592   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines         1415      1428   +13     
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+ Hits          1415      1428   +13     

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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[demel42]

A hint (from my fast test)

in the function "get_vehicle_image", headers must now also include the entry "bmw-app-vehicle-type" with the value "connected"

return values from the server was

"statusCode":400,"error":"Bad Request","message":["bmw-app-vehicle-type should not be null or undefined","bmw-app-vehicle-type must be one of: connected, demo, non-connected, predelivery"]

i din't use python, so i can't create an pull-request

i think it should bei

headers={"bmw-vin": self.vin, "accept": "image/png", "bmw-app-vehicle-type": "connected"},

[rikroe]

Many thanks for the quick feedback! Adjusted this in #591 as well, as this is based on it.