save revision and submission history of comments #26

Currently, Gitcasso cannot save drafts - as soon as a tab is closed, the draft is lost.

The sketch of the proposed feature is below:

• if the user has opted-in to draft saving
• then we save the draft history of their comments in a local IndexedDB, with a storage model similar to Gmail
• all comments are saved forever, or you can prune to only save the past n months
• you can "trash" a comment, anything in trash for more than 30 days gets permanently deleted
• you can go into the trash and delete a comment immediately

There are some things you can vote on

• I want draft-saving -> ⭐ the repo and 👍 this issue
• I also want the option to opt-in to draft-saving on every textarea on any website -> 🎉 this issue
  • see also multi-textarea data model keyed on (url, timestamp) #98