ItemStackIcon - Add modern Custom Model Data

[ItsNature]

Overview

Description:
Adopts the Minecraft 1.21.4 CustomModelData item component

Changes:

• New CustomModelData builder: (floats, flags, strings, colors)
• New ItemStackIcon field CustomModelData customModelDataObject
• DeprecateItemStackIcon field int customModelData

---

Review Request Checklist

• Your code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have tested this change myself. (If applicable)
• I have made corresponding changes to the documentation. (If applicable)
• The branch name follows the projects naming conventions. (e.g. feature/add-module & bugfix/fix-issue)

---