fix/feat:Add support for One Off Charging Timeres as well as start_climatisation fix

[max-2468]

While doing some tests regarding PR #640 I did stumble across the toggle for start the climatisation of the car as well. Switching that on made a new field appear in the data send by the server.

Apparently the app/server/car will only notice this field once it has been manually set once, and will default a missing value to False. To handle this new field while ensuring compatiblity to the behaviour shown by the app (and not having to manually edit a lot of fixtures as well as ensuring compatibility for new fixtures) a special type was used to handle the distinction True, False, Unknown/None.

The handling of One_off charging timers is based on PR #640 by ethanhawke-gif.

This PR includes:

• new fixtures testing all options available on charging profiles/charging timers, one_off timers as well as the climatisation switch
• an updated handling of fixture test cases to handle the optionality of new fields (by doing a complete JSON => model => JSON roundtrip and then loading both the resulting JSON as well as the fixture as a dict).
• some more fixes to the charging profile test case

[dvx76]

Thanks for your contribution!

Can you please look at replacing the tribool package?

For the one_off_day fix, either remove that from your PR, or rebase on top of #640 . Don't create your own commit with the same change.

[dvx76]

Can you try to implement this without the tribool package.

This adds another package dependency for something relatively trivial. More importantly that package hasn't been updated since 2016 and includes some questionable behavior (e.g. bool(Tribool(True)) raises a TypeError)

The start_climatisation field can just be typed as bool | None.