feat(lsp): Add a codelens that runs test when clicked

[phated]

Description

Problem*

First implementation of #1834

Summary*

This adds the infrastructure to display codelenses via the LSP. The first codelens that we support is the > Run Test action above functions marked via #[test]. The lens will display in any version of the vscode extension, but there is no command registered for nargo.test in the currently released version. We are adding the nargo.test command in noir-lang/vscode-noir#25 (you can package it into a vsix and install manually to try).

Documentation

• This PR requires documentation updates when merged.

  • I will submit a noir-lang/docs PR.
  • I will request for and support Dev Rel's help in documenting this PR.

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[kobyhallx]

👍