Contributor DevX: Enable per-project builds

[michaeltlombardi]

Summary of the new feature / enhancement

As a contributor, I want to quickly rebuild only the project I'm currently working on, not the full set of projects, when I make a change I want to validate and explore that doesn't affect the other projects, so I can iterate more quickly.

For example, reviewing any change to the registry resource requires running the build script and regenerating the tree sitter, DSC itself, and all the unrelated projects - which can take several minutes for each build.

Proposed technical implementation details (optional)

Enhance the build script to support a Project parameter that only deletes and rebuilds the specified projects, not the entire output folder. Alternatively, add per-project build scripts that a contributor can execute to rebuild only that project.