[FEATURE] Connect an existing Github Repository to a Pipedream project

**Is your feature request related to a problem? Please describe.**

I would like to be able to connect an existing GitHub Repository to a Pipedream Project and bootstrap any defined workflows within the existing GitHub Repository to my connected Pipedream project.

**Describe the solution you'd like**

I would like to be able to clone older Pipedream Projects from the GitHub sync'd serialized workflows into other projects on my same Pipedream workspace.

Allowing syncing of pre-created workflows on a GitHub Repository allows me to use publicly available GitHub repositories to bootstrap my own Pipedream projects.

**Do you have a workaround?**
Only by relying on shared workflow links, that are only available on a per workflow basis and don't include the entire project.