Use MixinExtras to greatly improve mod compatibility

[EthanRStokes]

• Updates Gradle to 8.4
• Updates Fabric Loom to 1.4-SNAPSHOT
• Embeds MixinExtras
• Fixes many instances of mod compatibility issues by using injectors and modifiers provided by MixinExtras (ex: sun size option from Configurable Everything)
• Fixed parameters for sneaking shield
• Fixes [URGENT] [Bug] Could not execute entrypoint stage 'client' due to errors, provided by 'bedrockify'! #280

Will need to be tested as I may or may not have made a mistake when porting the mixins.

On a side note, I noticed that the sneaking shield is disabled. Is there anything preventing from adding that back?

[EthanRStokes]

Since Mixin Extras was recently built into Fabric Loader, I may change this PR to not embed Mixin Extras and just require the latest loader version
However, that loader version is a beta, so I won’t do anything until there’s a release version out.