[1.21] Implement common networking with config tasks

[Shadows-of-Fire]

This PR changes the common networking approach to use configuration tasks instead of simply sending the packets during connection init. This aligns with the expectations set by fabric in FabricMC/fabric#3244.

Fixes #1473

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: e807fde261fb619719e4c6326469e59e4c841c71.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:neoforge:21.1.25-pr-1483-creg-config-tasks
• 📦 net.neoforged:testframework:21.1.25-pr-1483-creg-config-tasks

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 #1483' // https://github.com/neoforged/NeoForge/pull/1483
        url 'https://prmaven.neoforged.net/NeoForge/pr1483'
        content {
            includeModule('net.neoforged', 'neoforge')
            includeModule('net.neoforged', 'testframework')
        }
    }
}

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-pr1483.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1483
cd NeoForge-pr1483
curl -L https://prmaven.neoforged.net/NeoForge/pr1483/net/neoforged/neoforge/21.1.25-pr-1483-creg-config-tasks/mdk-pr1483.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.

[sciwhiz12]

Tested and it works. Connecting to a Fabric (w/ Fabric API) server (incl. the server mentioned in the original issue) works, as well as connecting to a NeoForge server without the changes in this PR. Also tested with a Fabric (w/ Fabric API) client connecting to a server with this PR, and that too works.

[neoforged-releases]

🚀 This PR has been released as NeoForge version 21.1.34.