Enchantment glint animation is hardcoded

Relates to MC-276497 and MC-277503.

The bug

The enchantment glint, despite being an animation, is not customizable like other texture animations. The graphic it uses can be changed, but there is no way to change how the animation itself works, unlike what is the case for other animated objects in the game.

The hardcoded nature of this also introduces other issues, such as MC-276841.

How to fix

Make the enchantment glint use a proper mcmeta system like other texture animations.