feat(vscode): support workspaces and monorepo

[claneo]

Summary

1. config.ts
   1. define config schema and default value using valibot (or zod?)
   2. replace inspect with get, which already picked value by priority
   3. add a new function watchConfigValue
2. launch.json: change preLaunchTask from build to watch
3. worker/index.ts: pass configFilePath to rstest core, rename cwd to root
4. extension.ts
   1. removed document event handlers, which seem unnessary
   2. handle and process all workspaces
5. master.ts: using config file path as cwd when resolve and spawn worker
6. project.ts/WorkspaceManager: scan and watch all rstest config files matching glob inside this workspace
7. porject.ts/Project
   1. set config file's parent director as root directory
   2. scan and watch all test files matching glob inside root drector
   3. spawn worker
8. testTree.ts run test with corresponding worker

It scans all rstest config files across all workspaces, and create separate worker for each project.

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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