feat(developer): ID field in new keys in the touch layout

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

When pressing one of the green triangles with the “+” sign on the touch layout, a new key is created, whose “Text” and “Unicode” fields are set to an empty string and the “ID” field is set to a value in the form of “T_new_???” (where the question mark stands for any cipher). Then, writing a text in the “Text” field, let’s say “ŭ”, the “Unicode” field is automatically set to the “U+016D” value, but the “ID” field is not set to anything, while it could be more useful, if it was automatically set to “U_016D”.

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Related issues

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### 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

_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_