Allow post copy dotnet tool install

### Is your feature request related to a problem? Please describe.
I am trying to create a .NET tool for DSC v3 resources. I've successfully created the .NET tool, but it's lacking a post-copy step.

I would like to be able to copy the resource manifest in the root of the tools directory, rather than manually copying it here or set the PATH environment variable to something like: `C:\Users\\.dotnet\tools\.store\universaldsc.resource.windows.user\0.1.0\universaldsc.resource.windows.user\0.1.0\tools\net9.0\any`

### Describe the solution you'd like
Add the ability to provide a post-copy task in the DotnetToolSettings.xml.

### Additional context
Add any other context or screenshots about the feature request here.