feat(developer): Report a problem if both LALT and RALT layers are used

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

In the past, I thought Keyman developer used to report a problem is both LALT and RALT layers were used.

### Describe the solution you'd like

I'd like to see Keyman Developer refuse to compile if there are rules for both LALT and RALT.

### Describe alternatives you've considered

I would at least expect a warning in the "Messages" Window about LALT not being a good rule as that is often a hotkey for applications.

### Related issues

_No response_

### Keyman apps

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

### Keyman version

16.0.144

### Operating system

Windows 11

### Device

Windows Dell laptop

### Target application

_No response_

### Browser

_No response_

### Keyboard name

https://github.com/keymanapp/keyboards/pull/2449

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_