feat(windows): Create a portable version of Keyman for Windows

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

Build and release a portable version of Keyman so that one does not have to install it to use it.

We so used to using our custom keyboard layouts that at times when we have to work on client’s PC we have ask for their permission to install Keyman but some clients refuse to install anything on their PCs due to their policies.

In such cases it would be great if there was a portable version which doe not require any installation to use.

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Related issues

_No response_

### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [ ] Keyman for macOS
- [x] 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_