[FEATURE]: Github Copilot authentication as AI Provider

[raoofaltaher]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Adding a new AI provider 'Github Copilot' using browser based authentication with github account for copilot subscription.

note, this feature is available in opencode.

[Shravanth007]

Is this approved? To be taken?