Add support for "cargo install" for crates and support for user specified cargo commands

[novacole]

Cargo Install Adds support for "cargo install",which allows crates to be installed directly with the sdk Example usage: msbuild /t:CargoInstall=nextest /p:CargoInstallCommandArgs=--locked cargo-nextest

Adds support for user specified commands.

Example usage: msbuild /t:CargoCommand=nextest /p:CargoCommandArgs=run

-- Also minor refactoring around the naming of targets