🔑 Add an ability to retrieve eKey locks

[fastiuk]

Why I did it

• To discover and control remote locks (the locks that were assigned to you by someone else)

How I did it

• Call API for remote locks and add them to the list of discovered ones
• Call API to show detailed information of the remote lock

Tested on

Asia-Teco K2

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 73.47%. Comparing base (2622bb6) to head (052736a). Report is 34 commits behind head on develop.

Files with missing lines	Patch %	Lines
custom_components/ttlock/api.py	0.00%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #83 +/- ## =========================================== - Coverage 74.40% 73.47% -0.93% =========================================== Files 13 13 Lines 633 641 +8 =========================================== Hits 471 471 - Misses 162 170 +8 ```

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