Use babel for traspiling rather than closure compiler

We recently switch from using closure-compiler with `WHITESPACE_ONLY` to closure-compiler with `SIMPLE_OPTIMIZATIONS`. However this had the negative side effect that all input need to be free of closure compiler warnings, and this turned out not to be practical for all users. See emscripten-core#20810 for more on this When selecting a transpilation tool use I also evaluated `swx` (written in rust) and `esbuild` (written in go). `esbuild` was rejected because the simply don't support ES5 (evanw/esbuild#297). `swx` was rejected because it almost doubled the side of our `node_modules` directory by adding two 50mb binary files.
sbc100 · Dec 8, 2023 · c616402 · c616402
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diff --git a/.flake8 b/.flake8
@@ -1,6 +1,7 @@
 [flake8]
 ignore = E111,E114,E501,E261,E266,E121,E402,E241,W504,E741,B011,B023,U101
 exclude =
+ ./node_modules/, # third-party code
  ./third_party/, # third-party code
  ./tools/filelock.py, # third-party code
  ./tools/scons/, # third-party code