Install a nuget tool on demand

There are cases where a specific tool is only needed in certain cases. If that tool is a bit bigger (like `JMeter` in my case), it would make sense to request / download / install that tool from nuget only when it is needed (for example inside a `Task`).
So please add some kind of alias to install a tool on demand.

Start from the requested behavior in the issue: allow a tool such as JMeter to be requested, downloaded, and installed from NuGet only when needed inside a Task. The payload names no source files, entry points, or tests, so identifying the relevant tool-installation API and defining completion criteria will require project research.

Written by the indexing model from the issue text.