feat: Github Onramp v0.1: Sync RFPs with Github Issues

[tchardin]

What's included in this pr + description

• GitHub webhook endpoint for subscribing to repo issues.
  • Issues labeled as rfp will trigger an event and the Station GitHub bot comments under the issue with a link to a pre-filled RFP. This means we limit events to issues explicitly labeled so as not to spam every issue.
• RFP form can be accessed without a workspace address from a url commented under the issue.
• RFP form is filled with initial content from the GitHub issue.
• The RFP database object keeps a reference to the GitHub issue so it can be linked to webhook updates or submit changes to the upstream issue.

Motivation & Context

See the proposal for context.

Steps to test

• Open an issue with an "rfp" label
• Follow the link
• Create an RFP

Screenshots and/or loom video

Outstanding issues

• [ ] Validate flow with a few users.
• [ ] Properly handle upstream changes to the RFP
  • Need to validate a potential inbox of request changes or automatically sync and sign changes to the RFP.
  • Update GitHub issue if any changes are made to the content in the RFP form.

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