This is a library mod! If you're not a developer, don't worry about it. This is probably in your modpack as a dependency for another mod.
If you are a developer, hello! This library is specifically designed to work alongside my multiversion template mod which I use to release mods simultaneously on 1.20 & 1.21 on Forge & Fabric, from one codebase. Besides random stuff I find useful, this mod mostly contains platform and version specific implementations to cut down on the amount of repeated if/else when maintaining projects across versions. You're welcome to use it, but documentation is provided on a when-I-have-extra-time basis.