Remove a bunch more experimental annotations

[Machine-Maker]

Removes Experimental status from the following:

• Brigadier API
• Lifecycle events (just the general system and the brig event)
  • Tags event and datapack discovery and registry events are all still Experimental
• PluginMeta
• TagKey
  • including all constant files
  • Just TagKey, not our new Tag, RegistryKeySet, RegistrySet, etc and associated method
• BlockData#createBlockState()
• BlockState#copy(), BlockState#copy(Location)
• AbstractArrow#getItem(), AbstractArrow#setItem()
• Player#sendBlockUpdate(Location, TileState)
• BlockDispenseLootEvent
• VaultDisplayItemEvent
• Player input
  • PlayerInputEvent
  • Input
  • Player#getCurrentInput()
• EquipmentSlotGroup
• TrialSpawnerConfiguration
• JukeboxSong

Still Experimental

The main groups still marked as experimental are

• data components
• registry modification API
• tag, registry sets
• Position
• tag lifecycle events, datapack discovery lifecycle event
• plugin bootstrap stuff

[Strokkur424]

Local classes are cool