feat(android): Layout Switch Shortcut on Android Physical Keyboard

### Is your feature request related to a problem? Please describe.

A keyboard shortcut for keyboard layout switching on Android physical keyboards would be great since it will eliminate the need to switch to another input method for typing in a layout already found in Keyman keyboard list.

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Related issues

_No response_

### Keyman apps

- [x] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [ ] Keyman for macOS
- [ ] Keyman for Windows
- [ ] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

_No response_

### Operating system

_No response_

### Device

_No response_

### Target application

_No response_

### Browser

_No response_

### Keyboard name

_No response_

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_