emsdk

[Bazel] Let audio workout bootstrap js file be generated. (#1404)

* Allows generation of audio worklet bootstrap js file

In order to allow users to generate the file, the allowed extension list in `link_wrapper.py` has been updated accordingly.

* adds audio worklet js to wasm_cc_binary too

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Co-authored-by: William Izzo <william.izzo@hey.com>