Feature Request: Ability to generate only specific tiles

Nobody has claimed this yet.

_*Update: just realized that there is already an option to produce a single tile (#521). I could obviously run this sequentially, but would be a bit easier if I could:_
1. _Just provide a CSV file or something with Z/X/Y_
2. _Run the "one-tile" (-R) function on tile-join_

**Requested functionality:**
I know that Tippecanoe currently allows users to specify a bbox to generate only the tiles that fall within that bbox, but it would be nice if we could pass a manifest of specific tiles (z/x/y) for Tippecanoe to generate

**Reasoning:**
I'm trying to create a hot-swapping tileserver backend that regenerates only specific tiles as the data changes. If I use the bbox functionality, it will generate all tiles within that bbox instead of only the specific tiles I'd like to change. For large tilesets, this could lead to a substantial overhead

Start by reading Tippecanoe's existing bbox handling and the one-tile (-R) option, including the related tile-join behavior. Determine how a CSV or other z/x/y manifest could be accepted and how requested tiles would be selected; done means only the listed tiles are generated without expanding to the full bbox.

Written by the indexing model from the issue text.