Add form to submit a new gpg key

[Yantrio]

We have the validation logic that you can run using go run ./cmd/verify-gpg-key --key-file=../path/to/keyfile --username=Yantrio --org=OpenTofu in the src directory, and this prints a report to stdout.

We should add a form that will ask people the to paste the following:

• The github organization/Provider namespace they want to add the gpg key to
• The armoured public pgp key (maybe with an example so people understand what to paste!)

This issue form once filled in should do the following

• Copy the key to a file
• Invoke the verification script (Use the form filler's name for github username, and the github org from the form)
• Add the stdout of that script as a comment to the issue
• Create a PR to add that gpg key to the repo