UniformArrayNode: add support for mat2, mat3 and mat4 types

[holtsetio]

Description

This change adds support for mat2, mat3 and mat4 datatypes in uniform arrays which was missing before. mat3 values are uploaded as mat4 to ensure 16 byte alignment.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.11 78.98	339.11 78.98	+0 B +0 B
WebGPU	484.85 134.59	485.33 134.73	+485 B +134 B
WebGPU Nodes	484.31 134.5	484.8 134.63	+485 B +133 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	465 112.04	465 112.04	+0 B +0 B
WebGPU	554.24 150.04	554.72 150.17	+485 B +123 B
WebGPU Nodes	510.12 139.75	510.61 139.88	+485 B +120 B