[Protocol Support]: Add support for fetching non-https protocols

[fallaciousreasoning]

Hey, thanks for the great plugin, it works really well. I've forked the repo and hacked in support for custom protocols so I can load tiles from IndexedDB. Would you be interested in a PR for the feature (if I clean it up)?

I know that this repo is probably going to be deprecated once maplibre/maplibre-style-spec#583 is resolved (and it'll give us native protocol support) but thought I'd check.

[msbarry]

Thanks for reaching out! I'd rather not update/maintain any extra functionality in this plugin between now and when I get it incorporated as a first-class feature in maplibre. That IndexedDB functionality seems handy though as a way to load tiles when offline, is it open source? If not that might be an interesting project to make available for projects to use with other maplibre sources?

[fallaciousreasoning]

Yeah, figured that might be the case 😄 It is yeah, but just as part of my side project https://alpha.topos.nz
https://github.com/fallaciousreasoning/topo/blob/alpha-react/src/caches/cachingProtocol.ts

I could probably move it into its own thing pretty easily. Okay, going to close this as wontfix