Paper-only `damage_item` (#2568)
* damage_item mech
* Minor fixes, more coming soon.
* Updated map value checking
* Revert spawnedOnly, echoerror fix, meta fix
* Resolves multiple comments.
* Meta update
* Another meta update
* Instanceof pattern matching
* Error message update
* Nuked ItemTag mech as instructed, updated EntityTag mech meta
https://discord.com/channels/315163488085475337/1191202417430237204/1191743816647069776
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commit: e2fb4e5)
