Provide a way like `nvm` to mange .NET SDKs

### Is your feature request related to a problem? Please describe.
The task of installation does not have a consistent method across different operating systems and platforms. It would be more convenient if managing multiple versions of .NET SDKs, from installation to usage, could be modeled after the way sdkman or nvm does it. I believe this would be a very convenient design and hope the .NET team can consider this suggestion.

### Describe the solution you'd like
I hope to provide .NET Version Manager just like [nvm](https://github.com/nvm-sh/nvm):

Examples:

```sh
$ dvm use 9
Now using .NET SDK 9.0.301
$ dotnet --version
9.0.301
$ dvm use 8
Now using .NET SDK 8.0.412
$ dotnet --version
8.0.412
$ dvm install 6
Now using .NET SDK 6.0.428
$ dotnet --version
6.0.428
```

### Additional context
N/A