[WIP] runtime/js: js for emscripten

[visualfc]

TODO

• github.com/goplus/llgo/runtime/js
• CopyBytesToGo/CopyBytesToJS

error for move to syscall/js

error: undefined symbol: internal/bytealg.init (referenced by root reference (e.g. compiled C/C++ code))
warning: To disable errors for undefined symbols use `-sERROR_ON_UNDEFINED_SYMBOLS=0`
warning: _internal/bytealg.init may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: internal/reflectlite.TypeOf (referenced by root reference (e.g. compiled C/C++ code))
warning: _internal/reflectlite.TypeOf may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: internal/reflectlite.init (referenced by root reference (e.g. compiled C/C++ code))
warning: _internal/reflectlite.init may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: math.init (referenced by root reference (e.g. compiled C/C++ code))
warning: _math.init may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
warning: JS library symbol '$allocateUTF8' is deprecated. Please open a bug if you have a continuing need for this symbol [-Wdeprecated]
Error: Aborting compilation due to previous errors
emcc: error: '/usr/local/opt/node/bin/node /usr/local/Cellar/emscripten/4.0.8/libexec/tools/compiler.mjs -' failed (returned 1)
panic: exit status 1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.71%. Comparing base (f0728c4) to head (e972be8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1180   +/-   ##
=======================================
  Coverage   87.71%   87.71%           
=======================================
  Files          29       29           
  Lines        7279     7279           
=======================================
  Hits         6385     6385           
  Misses        827      827           
  Partials       67       67           

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