add some "scriptable" switch variant

the goal is that the selector is not shown and the target to switch to is given directly at the commandline.

something like:
```
dotnet jvs switch --to="C:\Program Files\Amazon Corretto\jdk15.0.2_7"
```

or better still:
```
dotnet jvs alias add --name=jdk15 --target="C:\Program Files\Amazon Corretto\jdk15.0.2_7"
dotnet jvs switch --to=jdk15
```