Restore ability to enable stenciling

[Technici4n]

• Restore the ability to enable stenciling, by using an event that enables stencil for the main render targets.
• Move mod construction, registry events, and config loading a bit earlier on the client.
• Add a config option to choose between 32+8 and 24+8 stencil formats. We default to 32+8 because that is what was done in 1.21.1, but it is now possible to experiment with 24+8. It is still not clear what the performance benefits of 24+8 are, and whether this causes visual artifacts or not.
• Add a basic test mod to validate that stencil can be enabled and used.

This PR is derived from #1715 with a lot of additional change since. Also brought further simplifications from FiniteReality#1.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: e8f3e144f2701e62c1469de68b9c40a78f9bfac3.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:testframework:21.4.95-beta-pr-1830-feature-depth-stenciling
• 📦 net.neoforged:neoforge:21.4.95-beta-pr-1830-feature-depth-stenciling

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 #1830' // https://github.com/neoforged/NeoForge/pull/1830
        url 'https://prmaven.neoforged.net/NeoForge/pr1830'
        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-pr1830.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1830
cd NeoForge-pr1830
curl -L https://prmaven.neoforged.net/NeoForge/pr1830/net/neoforged/neoforge/21.4.95-beta-pr-1830-feature-depth-stenciling/mdk-pr1830.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.

[shartte]

Ok yeah I think this is nice.
We can add to PostChain if we discover issues with it later.