Integration with other repository managment providers

[aalbuerne]

After getting feedback from the comunity, developers and engineering teams, GitHub is wide used but not the only provider to authenticate into the product and manage repositories and application.

The idea with this new feature is to integrate additional authentication providers to have an account in Resizes Dash and a single source for managing Dash and the code repositories.

Some Dev tools to integrate with: GitLab, Bitbucket, Gitea..