Add Lock BLE API documentation

[Minsheng]

:recycle: Current situation

Describe the current situation. Explain current problems, if there are any. Be as descriptive as possible (e.g., including examples or code snippets).

:bulb: Proposed solution

Describe the proposed solution and changes. How does it affect the project? How does it affect the internal structure (e.g., refactorings)?

:gear: Release Notes

Provide a summary of the changes or features from a user's point of view. If there are breaking changes, provide migration guides using code examples of the affected features.

:heavy_plus_sign: Additional Information

If applicable, provide additional context in this section.

Testing

Which tests were added? Which existing tests were adapted/changed? Which situations are covered, and what edge cases are missing?

Reviewer Nudging

Where should the reviewer start? what is a good entry point?

[Minsheng]

We have released the BLE broadcast definition for SwitchBot Lock. It now supports get the state of Lock, get the state of door, and get the state of battery.