Revamp the contribution process

[nikitastupin]

Hey 👋

The current process of contributing to diodb requires:

1. a GitHub account
2. basic knowledge of git which not all potential contributors have
3. in worst-case ability to resolve merge conflicts and time and energy needed to achieve the resolution

To address all of the issues I propose two solutions. We may implement both of them.

1. Google Form
2. GitHub issue forms

@jmanoto as we've discussed this topic, I'd like to hear your feedback 😃

Google Form

Removes all three aforementioned requirements. Can be scripted with Apps Script to make a PR from a submission. But we can start with handling submissions manually.

Example: https://forms.gle/VXCWJX3hRTVQArT39

GitHub issue forms

Solves 2nd and 3rd of the aforementioned requirements. We can create three templates (for addition, edit, and delete) and a workflow_dispatch workflow to make one PR from all currently open issues (and add authors of those issues to the commits so that they count as contributors). I can prototype it later.

[nikitastupin]

Perhaps, #346 will become obsolete once we solve this issue.

[nikitastupin]

We can also use https://www.typeform.com as Google Forms alternative

[nikitastupin]

Partially done in #404