Support Git Authentication via Git Access Token instead of username/password

[nploi]

Describe the solution you'd like

Currently, Karavan-app only supports Git authentication with username/password, which is outdated and less secure. Please add support for:

• OAuth Tokens (Personal Access Tokens for GitHub, GitLab, Bitbucket, etc.)

This will improve security and align with modern Git providers' best practices.

Variant

Web Application

Container Management (if applicable)

Docker

Operating System (for VS Code Extension)

None

[mgubaidullin]

GitHub Personal Access Tokens both Classic and Fine Grained could be set instead of password.