Carstate: Parse distance button from steering wheel

[sunnyhaibin]

Description

Parse the physical distance button from the steering wheel for all cars with existing signals defined in the DBCs.

• Platforms that do not have the button signal defined will be excluded.
• Platforms that have more than one (1) button to adjust the following distance (Plus, Minus, Distance Main, etc.) will only parse from the decreasing button at the moment. One solution is to have all buttons related to the following distance parsed as gapAdjustCruise for simplicity's sake.

Verification

Tested on sunnypilot on all platforms with openpilot Longitudinal Control support for over 12 months

Test routes with the button pressed and confirmed with the following distance changed on the cars' cluster:

• Chrysler
• Ford
• GM
• Honda
• Hyundai - Already supported
• Mazda
• Nissan
• Subaru
  • Pre-Global Subaru
  • Global, non-hybrid Subaru
• Tesla - Low priority as the brand is behind dashcamOnly
• Toyota (thanks to @arne182, @wocsor, @krkeegan, @dragonpilot, @rav4kumar, @eFiniLan, sunnypilot, @sunnypilot)

[adeebshihadeh]

• Platforms that do not have the button signal defined will be excluded.
• Platforms that have more than one (1) button to adjust the following distance (Plus, Minus, Distance Main, etc.) will only parse from the decreasing button at the moment. One solution is to have all buttons related to the following distance parsed as gapAdjustCruise for simplicity's sake.

This is why I wanted to start with just making this exceptions list before asking anyone to make a good PR. Is this documented somewhere?

That being said, this PR doesn't look as big as I thought it would be :)

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