Add unlatch action

[m10x]

added the unlatch action, so door can not only be locked/unlocked but also opened by unlatching the lock.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.09524% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 95.83%. Comparing base (2fb5f85) to head (027e7fe).

Files	Patch %	Lines
yalexs/api.py	83.33%	1 Missing :warning:
yalexs/api_async.py	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #101 +/- ## ========================================== + Coverage 95.76% 95.83% +0.06% ========================================== Files 29 29 Lines 3424 3528 +104 ========================================== + Hits 3279 3381 +102 - Misses 145 147 +2 ``` | [Flag](https://app.codecov.io/gh/bdraco/yalexs/pull/101/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/bdraco/yalexs/pull/101/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston) | `95.83% <98.09%> (+0.06%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston#carryforward-flags-in-the-pull-request-comment) to find out more.

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[m10x]

I'll try to add more tests (probably later today)

[m10x]

I was confused at firsttest_manual_unlatch_activity_v4, because I misinterpreted Unlatch as Manual Unlatch in my logs. But now the tests should be fine :)

[m10x]

CI passed but Codecov is down by 0.03%

[bdraco]

I need to find some time to test this on my production before merging.

Once I do that I'll make a release

[bdraco]

published to pypi as 3.0.0

Thanks @m10x