This makes it more usable with blocks that provide items (and so you don't have to call asItem) all the time.

For reference, this is what registering for a block (item) looks like:
https://github.com/i509VCB/BulkyShulkies/blob/1.16.x/src/main/java/me/i509/fabric/bulkyshulkies/client/BulkyShulkiesClientMod.java#L135