[feature] fetch all replies

[sneakers-the-rat]

Adds a button to the bottom of an expanded status to fetch all replies from the OP server (or as many as they will give us).

• Example: https://neuromatch.social/@jonny/109582537808504261
• Context: https://neuromatch.social/tags/FetchAllReplies
• Wiki: https://wiki.neuromatch.io/Fetch_All_Replies

The feature:

• Tries to figure out the API URL for the OP server (currently just using the masto pattern, consider that a TODO)
• Fetches the replies from the /statuses/{:id}/context endpoint
• Uses the search API on the host instance in order to fetch the necessary status and account information to display the status.

It also:

• Displays a dialogue box showing how many statuses it is grabbing

Still to do:

• Write tests (dont know hwo to do that in ruby)
• Catch errors better
• Insert into thread in correct order (refreshing fixes)

[github-actions[bot]]

This pull request has merge conflicts that must be resolved before it can be merged.

[sneakers-the-rat]

Closing in favor of: https://github.com/NeuromatchAcademy/mastodon/pull/44