AttributeNode: Fix serialization/deserialization.

[Mugen87]

Related issue: #28943

Description

The serialization/deserialization of node materials relying on AttributeNode fails at the moment.

Fiddle for reproduction: https://jsfiddle.net/anqx4whk/

The PR overwrites Node.serialize() and Node.deserialize() and honors the missing properties.

@sunag Is this the right approach? When I understand the code in the upper class correctly, private properties and properties holding primitive values are not honored so far and must be handled in the sub class.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
684 kB (169.4 kB)	684 kB (169.4 kB)	+0 B

🌳 Bundle size after tree-shaking

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

Filesize dev	Filesize PR	Diff
460.9 kB (111.2 kB)	460.9 kB (111.2 kB)	+0 B

[sunag]

@sunag Is this the right approach? When I understand the code in the upper class correctly, private properties and properties holding primitive values are not honored so far and must be handled in the sub class.

Exactly, it serializes only public nodes by default.