* Support Bazel builds on Apple silicon
* Add sha_mac_arm64 hash for 3.1.3
* Configure node_repositories in emscripten_deps.bzl
* Add mac arm64 to bazel workspace update script
Co-authored-by: Matthew Soulanille <matthew@guppy.home>
* Makes provided bazel rules look up @emsdk workspace instead of local workspace
* Uses system-specific emscripten binaries instead of defaulting to linux
* Provides macros for loading emsdk dependencies (nodejs and emscripten binaries)
* Unhardcodes paths in bazel rules and .sh wrappers
* `update_bazel_workspace.sh` now updates `revisions.bzl`
* `emscripten_deps()` can be fed with specific emscripten version
* Adds external usage test
Addresses #650 and #696
