Return the interfaces for models rather than the concrete models

[JSkimming]

No description provided.

[codecov]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #14   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          13     13           
  Lines         560    562    +2     
  Branches       71     70    -1     
=====================================
+ Hits          560    562    +2

Impacted Files	Coverage Δ
src/Tesla.NET/Models/Internal/EpochConversion.cs	100% <ø> (ø)
...c/Tesla.NET/Models/Internal/AccessTokenResponse.cs	100% <ø> (ø)
src/Tesla.NET/TeslaAuthClient.cs	100% <ø> (ø)	⬆️
src/Tesla.NET/Models/Internal/Vehicle.cs	100% <ø> (ø)
src/Tesla.NET/TeslaClient.cs	100% <ø> (ø)	⬆️
src/Tesla.NET/Models/Internal/MessageResponse.cs	100% <ø> (ø)
src/Tesla.NET/Models/Internal/VehicleState.cs	100% <ø> (ø)
...c/Tesla.NET/Models/Internal/ResponseDataWrapper.cs	100% <ø> (ø)
src/Tesla.NET/Models/Internal/ChargeState.cs	100% <ø> (ø)
src/Tesla.NET/Models/Internal/DriveState.cs	100% <ø> (ø)
... and 1 more

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