Move terminal process to main

[Tyriar]

Part of #74620
Fixes #71966

High level changes:

• Move local terminal process creation into electron-main - this is expected to improve terminal performance on Windows significantly
• Create TerminalProcessMainProxy that implements the ITerminalChildProcess interface across IPC, this behaves similar to TerminalProcessExtHostProxy
• Move parts of terminal into platform as required
• Updated node-pty to include the hang fix on Windows Host conout socket in a worker node-pty#415, Often getting full window hangs #71966

Next steps:

• Move the terminal process into a ptyhost process off of main:

  Main
    ptyhost
      bash
    Renderer
  

  ptyhost will be a regular node process such that we have access to worker_threads so we can fix the hang issue on Windows (Often getting full window hangs #71966).
• When support in Electron lands, use message ports between the pty host and the renderer such that main doesn't need to deal with the potential busy terminal data events, it's expected that we will handle the file watcher in a similar way where the native module is hosted in it's own process off main.

[Tyriar]

Closing in favor of #116373, we won't merge this in until the pty lives outside of main (context: #116337)