Check 3DTiles metadata base on their json schemas

[valentinMachado]

Your Environment

Google chrome Version 112.0.5615.49 (Build officiel) (64 bits), Ubuntu

Context

Motivation of this issue have been discussed here. To summarize the aim is to check metadata of a 3DTiles (extension, batchTable, and so on) based on the json schemas of the 3DTiles (which is the Cesium convention to desbribe these metadata). Since we don't want to make C3DTilesLayer dependant of another server (the one hosting the json schema) + these schemas are not guaranteed to be there, this check should be optional and should just print a warning.

EDIT: I am not sure if this validation code should belong to the client side or the backend side though