[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

---------

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

bazel/emscripten_toolchain/link_wrapper.py

@@ -90,7 +90,8 @@ extensions = [
     '.data',
     '.js.symbols',
     '.wasm.debug.wasm',
-    '.html'
+    '.html',
+    '.aw.js'
 ]
 
 for ext in extensions: