Fabric API — [1.19.4] Fabric API 0.80.0+1.19.4

— Bump version (modmuss50)
— Split test mods into client and common. (#3033) (modmuss50)
— Fix a regresstion preveting clients with an un-modded regsitry joining servers with modded registries. (#3036) (modmuss50)
— Add a Fake Player API (#3005) (Technici4n)