Feature: Add initial ServiceHistoryResponseModel

[CM000n]

This PR introduces the ServiceHistoryResponseModel, which makes it possible to retrieve and display information about past vehicle services and inspections.

See also DurgNomis-drol/ha_toyota#222 and #311

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (2c133e0) 70.50% compared to head (ad22204) 70.35%.

Files	Patch %	Lines
mytoyota/models/service_history.py	64.10%	14 Missing ⚠️
mytoyota/models/vehicle.py	26.66%	11 Missing ⚠️
mytoyota/api.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   70.50%   70.35%   -0.16%     
==========================================
  Files          30       32       +2     
  Lines        1434     1511      +77     
==========================================
+ Hits         1011     1063      +52     
- Misses        423      448      +25     

Flag	Coverage Δ
unittests	70.35% <65.00%> (-0.16%)	⬇️

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