fix: rewrite bundled extensions to mjs for esm build

[sachinraja]

The current index.mjs re-exports from the CJS .js files instead of the ESM .mjs files: https://unpkg.com/browse/[email protected]/lib/index.mjs. I guess tsup does not rewrite the extensions. This PR adds an esbuild plugin to rewrite the extensions for the ESM build.

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Name	Status	Preview	Updated (UTC)
tupleson-async	✅ Ready (Inspect)	Visit Preview	Nov 4, 2023 6:10pm

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[codecov]

Codecov Report

Merging #86 (98094a5) into main (4cf7fef) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   94.08%   94.08%           
=======================================
  Files          31       31           
  Lines        1876     1876           
  Branches      194      194           
=======================================
  Hits         1765     1765           
  Misses        109      109           
  Partials        2        2           

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