Fix chest opening animation sync

[RuiXuqi]

No description provided.

[what-the-diff]

PR Summary

• Updated the ReadMe File
  The README.md file has been updated to include a note clarifying that the issue with chest opening and closing animations not being in sync when using the Iron Chests feature, has been addressed.

• New Configuration Option
  A new configuration option "Fix Chest Opening Animation Sync" has been added in the UTConfigMods.java file under the Iron Chests category. This option is enabled by default.

• Modified the Mixin Loader
  The UTMixinLoader.java file has been enhanced to include a fix for the chest opening animation synchronization problem when the Iron Chests mod is present.

• Created a New Mixin Class
  A new mixin class, UTTileEntityIronChestMixin.java, has been created to manage client events for the Iron Chest. This class injects functionality to handle these events.

• Added a New Mixin Configuration File
  A new mixin configuration file, mixins.ironchests.animation.json, has been added to register the newly created mixin for the Iron Chests feature.