Consider integrating external regexes into Unfurl

[obsidianforensics]

There are some really interesting projects that aim to identify unknown text strings, such as pyWhat and lemmeknow. Some of these are stored as easily-consumable regexes. We should review them and see if there are some that we could leverage in Unfurl.

Links:

• https://github.com/swanandx/lemmeknow/blob/main/src/data/regex.json