Add support for draco compression to Core

[pandaGaume]

This PR add support for draco compression to the Core lib. For the purpose, we divided the DracoCompression class into an Encoder and a Decoder, keeping the old API with a deprecated flag. We now have a

• DracoCommons file which encompass all the standard declarations and interfaces
• DracoEncoder for encoding purpose
• DracoDecoder for decoding purpose.
• DracoCompression has been kept for backward compatibility, but greatly reduced as kind of decorator.

NO regression has been observed using GLTF Loader with KHR_draco_mesh_compression Test has been Also conducted by compressing and decompressing mesh on the fly using

  // encode the mesh
  var encoder = new BABYLON.DracoEncoder();
  return encoder.encodeMeshAsync(mesh).then((encoded)=> {
          // once done decode the mesh
          var decoder = new BABYLON.DracoDecoder();
          return decoder
              .decodeMeshAsync(encoded.data, encoded.attributes)
              .then((babylonVertexData) => {
                  // and apply the geometry to new mesh
                  const name = mesh.Name + "Dracoized"
                  const babylonMesh = new BABYLON.Mesh(name, scene);
                  babylonVertexData.applyToMesh(babylonMesh)
                  // finally return the mesh
                  return babylonMesh;
              })
              .catch((error) => {
                  throw new Error(`${error.message}`);
              });

from playground Note the above playround will not be functional until the PR will be merge. Test has been conducted changing the Draco wasm configuration to local

    let baseEncoderUrl = "http://localhost:1337/";
    
    const codecConfiguration  =  {
        decoder: {
            wasmUrl: baseEncoderUrl + "draco_wasm_wrapper_gltf.js",
            wasmBinaryUrl: baseEncoderUrl + "draco_decoder_gltf.wasm",
            fallbackUrl: baseEncoderUrl + "draco_decoder_gltf.js",
        },
        encoder: {
            wasmUrl: baseEncoderUrl + "draco_encoder_wrapper.js",
            wasmBinaryUrl: baseEncoderUrl + "draco_encoder.wasm",
            fallbackUrl: baseEncoderUrl + "draco_encoder.js",
        },

    };
    BABYLON.DracoEncoder.Configuration = codecConfiguration.encoder;
    BABYLON.DracoDecoder.Configuration = codecConfiguration.decoder;

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[deltakosh]

cc @pandaGaume to see if he has a few cycles to finish this one? Thanks a million!

[sebavan]

@pandaGaume, do you think you ll be able to finish this one ? or should we flag as draft until someone can pick up where it is ?

[bghgary]

@pandaGaume I'm closing this PR for now. We can reopen if it becomes active again.