Provide an API/Command to list what extensions own which installs of the .NET SDK/Runtimes

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

When we implement uninstallation in https://github.com/dotnet/vscode-dotnet-runtime/issues/1823, a user may think that uninstalling e.g. DevKit would be sufficient to remove SDKs/Runtimes, but that can be incorrect if any other extensions have requested an SDK/Runtime install. It would be good for a user to be able to see what extension(s) own which SDKs/Runtimes on demand.

### A clear and concise description of what you want to happen. Include any alternative solutions you've considered.

A user should be able to invoke a command and see a table/graph/etc of what the SDKs/Runtimes installed are and which extension(s) requested them.

### Describe the solution you'd like

See above?

### Additional context

_No response_