build wheels for emscripten

[davidhewitt]

Closes #151

[codspeed-hq]

CodSpeed Performance Report

Merging #185 will not alter performance

_{Comparing dh/wasm-build (cdf2c13) with main (4cefa8b)}

Summary

✅ 73 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.71%. Comparing base (4cefa8b) to head (cdf2c13).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #185   +/-   ##
=======================================
  Coverage   88.71%   88.71%           
=======================================
  Files          13       13           
  Lines        2207     2207           
  Branches     2207     2207           
=======================================
  Hits         1958     1958           
  Misses        153      153           
  Partials       96       96           

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