[3rd party] Meadow - track compatible projects in workspace

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

Similar to #5805 and #5806 today the Meadow extension for VSCode relies on O# events to be notified when the projects in the workspace change. It uses this event to then parse the project workspace in order to determine if there are Meadow compatible projects in the workspace to enable Meadow specific UI and functionality.

## Describe the solution you would like
Ideally Meadow could subscribe to a specific query where it matched projects with a known ProjectCapability, and could return matching projects and ideally infer a few evaluated msbuild property values for things like the project output path and build configuration.

## Applicable Scenarios
Meadow IoT developers using the VSCode Meadow Extension

## Describe alternatives you've considered
Meadow could watch the workspace for .csproj files and parse them out, or even create a shadow Roslyn MSBuild instance to track changes and evaluate properties, however this seems prone to interfering with csdevkit's project system.