Optimize .frag format

[agviegas]

Description 📝

Right now there is a lot of information in the format that is unoptimized (e.g. the express-fragment-map.json repeats a lot of strings instead of encoding them). Optimizing this will be critical for bigger models.

Suggested solution 💡

Include everything in the .frag file (geometry, properties and others), and optimize the structures that can be optimized (such as the express-fragments-map).

Alternative ⛕

No response

Additional context ☝️

No response

Validations ✅

• Read the docs.
• Check that there isn't already an issue that requests the same feature to avoid creating a duplicate.