feat: Ability to show ZWNJ symbol along with a text for "Key display text"

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

Need a way show ZWNJ symbol along with a text for "Key display text"

### Describe the solution you'd like

allow *ZWNJ* followed by Unicode text

### Describe alternatives you've considered

_No response_

### Related issues

_No response_

### Keyman apps

- [X] Keyman for Android
- [X] Keyman for iPhone and iPad
- [X] Keyman for Linux
- [X] Keyman for macOS
- [X] Keyman for Windows
- [X] Keyman Developer
- [X] 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_