Add max depth configuration for Roku project discovery

[Copilot]

This PR adds a configurable maximum depth limit when searching for Roku projects to prevent infinite loops and improve performance in deeply nested directory structures.

Changes Made

• Added maxDepth configuration: New optional setting in brightscript.languageServer.maxDepth with a default value of 15
• Updated project discovery: Modified discoverProjectsForWorkspace method to respect the depth limit when searching for:
  • bsconfig.json files
  • manifest files (for Roku projects)
• Enhanced type definitions: Updated BrightScriptClientConfiguration and WorkspaceConfig interfaces to include the new maxDepth property

Testing

Added comprehensive unit tests covering:

• maxDepth of 1 (finds only root level files)
• maxDepth of 5 (finds files up to 4 levels deep)
• maxDepth of 20 (finds all files within reasonable depth)
• Default behavior (uses maxDepth of 15)
• Both bsconfig.json and manifest file discovery scenarios

Usage

The maxDepth can be configured in VSCode settings:

{
  "brightscript.languageServer.maxDepth": 10
}

If not specified, the default value of 15 will be used, which should handle most reasonable project structures while preventing performance issues with excessively deep directory trees.

Fixes #1528.

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