Lock component to have on_open trigger

**Describe the problem you have/What new integration you would like**

I wish to be able to execute code when the lock.open action occurs via a lock.on_open trigger.

**Please describe your use case for this integration and alternatives you've tried:**

I'm designing a time lock where a box can only be opened at certain times. The times when the box can be operated are indicated by the lock/unlock status which are updated by a time event. To actually open the box the lock.open action is fired. The on_open function contains the code to fire the GPIO connected solenoid.

Current work around is to bypass the lock.open action and add code elsewhere.

**Additional context**

The documentation doesn't cover the purpose of the lock.open action and any functionality that calling it invokes.