[feature] Git sync

As a Workflow Developer

I want to store workflow definitions in Git

So that I can back it up and also have, if required, a fully CI/CD development cycle

Acceptance Criteria
- [x] support for Git
- [x] support for GitHub
- [x] support for GitLab

Definition of Done
TODO

Technical details:
- Sync should be two-way:
1. Git -> ByteChef - ByteChef pulls for changes
2. ByteChef -> Git- ByteChef pushes for changes
- There is already support for reading from git
- Check for ideas:
- https://docs.appsmith.com/advanced-concepts/version-control-with-git/cd-with-github-actions
- https://docs.appsmith.com/advanced-concepts/version-control-with-git
- https://docs.appsmith.com/advanced-concepts/version-control-with-git/environments-with-git
- https://www.codeaffine.com/2014/12/09/jgit-authentication/