…target

Context: dotnet/sdk#42155
Context: dotnet/sdk#42240
Fixes: dotnet/sdk#31253

The .NET SDK has introduced a new `ComputeRunArguments` MSBuild target
that allows you to set `$(RunCommand)` and `$(RunArguments)` in a more
dynamic way.

So, on Android:

* `ComputeRunArguments` depends on `Install`, so the app is deployed,
  the `<FastDeploy/>` MSBuild target runs, etc.

* `$(RunCommand)` is a path to `adb`

* `$(RunArguments)` is an `shell am start` command to launch the main
  activity.

The new implementation also allows us to use the `-p` parameter with
`dotnet run`, such as:

    dotnet run -bl -p:AdbTarget=-d

This will pass `-d` to `adb`, which allows you to select an attached
device if an emulator is running.

Previously, we had no way to pass `-p` arguments to `dotnet run`.