onnxruntime

c373a808 - Add "glue" between training WASM artifacts and training web (#17474)

Add "glue" between training WASM artifacts and training web (#17474) ### Description * follows the packaging approach according to the design document * adds `ENABLE_TRAINING` boolean flag to `BUILD_DEFS` * modifies `package.json` to include training submodule * modifies build script to handle, validate, and minimize training WASM artifacts * adds the binding for the new backend with training enabled & the new training artifacts * adds training backend * edits `index.ts` to use training backend depending on `BUILD_DEFS` * edits `wasm-factory.ts` to use the training artifacts if necessary ### Motivation and Context * we are in the process of adding web bindings to enable training. * Adding the "glue" to allow onnxruntime-web to use the training WASM artifacts is required for this work. * Since BUILD_DEFS is defined and used at build time, I thought that it made sense to bundle the changes to building in the same PR. #### Related work * #16521 allowed for training artifacts to be built * #17333 must be merged in before this one --------- Co-authored-by: Yulong Wang <7679871+fs-eire@users.noreply.github.com>