Add a display name extension to KeyMapping

[Matyrobbrt]

This PR adds a getDisplayName method to IKeyMappingExtension, allowing custom key mapping implementations to show users a name in the keybindings GUI that is not a translatable component of their ID.
This method can be used, for instance, by generated key mappings that are not statically known at build-time and therefore have no translations for their names. I am working on a mod which allows users to create their own key bundles on-demand to disambiguate keymappings and I need to display the name they gave to the bundle in the bindings UI instead of an untranslated translation key.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: ceb012199462d167645e7e1ba4fcd169f3dec951.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:neoforge:21.4.51-beta-pr-1826-keymapping-display-name
• 📦 net.neoforged:testframework:21.4.51-beta-pr-1826-keymapping-display-name

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 #1826' // https://github.com/neoforged/NeoForge/pull/1826
        url 'https://prmaven.neoforged.net/NeoForge/pr1826'
        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-pr1826.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1826
cd NeoForge-pr1826
curl -L https://prmaven.neoforged.net/NeoForge/pr1826/net/neoforged/neoforge/21.4.51-beta-pr-1826-keymapping-display-name/mdk-pr1826.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.