feat: add vscode-desktop-core module

[phorcys420]

This PR introduces a new vscode-desktop-core module that acts similarly as AgentAPI does for other modules as an effort to centralize the logic.

This will help with avoiding maintaining multiple modules that do the same thing. I will follow shortly with a PR for a vscode-web-core module to centralize the logic for vscode-web and code-server as we've had issues where both would behave differently due to forgetting to update one or the other.

This will also help make the amount of effort lower if we ever need to implement a module for another vendor (or if a community member does).

Modules update in #279

[matifali]

Thanks a lot @phorcys420. This will significantly enhance the DevEX for module development and maintenance.

[matifali]

Thoughts on adding MCP server support?
We can add a generic input named mcp_config and mcp_path, which we can use from browser modules.

Here are a few examples

1. Windsurf: /Users/matifali/.codeium/windsurf/mcp_config.json
2. Cursor: ~/.cursor/mcp.json
3. VS Code: Didn't find a user specfic setting path

[phorcys420]

@matifali I want to add a config (and maybe extensions) entry in a next PR like we have for the code-server module, I think it should solve that.

[matifali]

Nice. But I think exposing MCPs separately would make more sense given how popular they are.