[1.20.6] Add ComponentItemHandler for using IItemHandlerModifiable with Data Components

[Shadows-of-Fire]

This PR adds the new ComponentItemHandler class for out-of-the-box handling of IItemHandlerModifiable with data components, since ItemStackHandler is no longer suitable for this purpose.

This class was adapted from the prior implementation (ShulkerItemStackInvWrapper) and generified to any DataComponentType<ItemContainerContents> as well as improved to reduce the number of component accesses. Shulkers have been updated to use ComponentItemHandler instead of their own special-purpose handler.

This is the IItemHandler analogue to #985.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: 071579b3ff2a463cac1cfae4ea3de05ec6da28ca.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:testframework:20.6.84-beta-pr-990-component-item-handler
• 📦 net.neoforged:neoforge:20.6.84-beta-pr-990-component-item-handler

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven {
        name 'Maven for PR #990' // https://github.com/neoforged/NeoForge/pull/990
        url 'https://prmaven.neoforged.net/NeoForge/pr990'
        content {
            includeModule('net.neoforged', 'testframework')
            includeModule('net.neoforged', 'neoforge')
        }
    }
}

MDK installation

In order to setup a MDK using the latest PR version, run the following commands in a terminal.
The script works on both *nix and Windows as long as you have the JDK bin folder on the path.
The script will clone the MDK in a folder named NeoForge-pr990.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr990
cd NeoForge-pr990
curl -L https://prmaven.neoforged.net/NeoForge/pr990/net/neoforged/neoforge/20.6.84-beta-pr-990-component-item-handler/mdk-pr990.zip -o mdk.zip
jar xf mdk.zip
rm mdk.zip || del mdk.zip

To test a production environment, you can download the installer from here.