Read only optimization

[tr7zw]

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[what-the-diff]

PR Summary

• Enhancement of Safe and Copy-Style Data Access
  Addition of a 'read-only' mode for NBTEntity, NBTTileEntity and NBTItem that allows copying of existing entities, blocks, or items and reading data without altering the original assets. The new mode provides a safer method for interacting and assessing data, minimizing unwanted changes to original records.

• Modification of Methods
  The 'getCompound' and 'setCompound' methods in NBTEntity, NBTTileEntity, and NBTItem have been updated to coordinate with the new 'read-only' feature. 'getCompound' will now verify if an object is in 'read-only' mode and, if applicable, return a copy of the compound instead. 'setCompound' will generate an error if attempted on a 'read-only' object, ensuring the preservation of original data.

• Paving the Way for Future Creation of Read-Only NBTItems
  A new constructor has been introduced to NBTItem facilitating the creation of 'read-only' NBTItems, broadening the capacity for more secure interactions with item data in the future.

• Improving Existing Test Methods
  Updates to the 'test' method within 'DirectApplyTest' forces items to be real instead of Spigot-only items, enhancing test accuracy.

• Improving Utils for CraftItemStack
  Addition of the getCraftItemHandle method and field_handle field, in NBTReflectionUtil, offering a more streamlined way to retrieve and handle CraftItemStack specific data.