GS Datastream

[CedricGuillemet]

• Decompression support for Gaussian Splatting data
• Plugin is named DataStream (shall it be a polyfill ?) and register a few new objects: DecompressionStream, ReadableStream, Response, TextDecoder
• Adding miniz and libdeflate depencies. miniz only support 1 type of gzip compression. libdeflate doesn't support file hierarchy. So, adding both for gzip (SPZ) and zip (SOG)
• It's not meant to be a full implementation but rather a working solution so this code runs : https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/loaders/src/SPLAT/splatFileLoader.ts#L252-L267
• more PRs to come with testing and documentation
• up Babylon.js to 8.34.0
• Extend Canvas Image with new methods. SOG format is based on webp.