New 1.19+ `MaterialTag.is_enabled` tag

[heypr]

• Requested by jironis on Discord.

[tal5]

Should have a note + link to this tag on server.material_types's meta (I.e. this might be disabled, check with X) - also there's a bunch of other stuff that can be enabled/disabled if you want to add tags for that as well, but can be done in a separate PR