* Improve curseforge and local indexing
This should make curseforge indexing more efficient, and reuses
some of the normal local indexing for the queued indexing of
recently created mods.
* Unify impls for single and multiple routes for mods and versions
This uses the same backend for the single and multiple query
routes so that they no longer return inconsistent information.
* Cache valid curseforge mod ids to reduce request load
This caches the ids of minecraft mods and reuses them on indexing
to reduce the amount of unused addons that are returned.
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