LSP: Custom message to provide test metadata

[phated]

Problem

We need to use the compiler frontend to extract tests to make available to the testing panel in vscode. To do this, we can leverage custom messages with the LSP to send these down after processing a program.

Happy Case

All the user needs is the vscode plugin and LSP to have a nice testing panel in their editor

Alternatives Considered

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

Yes

Support Needs

No response