Reduce bundle size by using meriyah.esm.mjs in favor of meriyah.esm.js

[benmccann]

Right now there is both a meriyah.esm.js and meriyah.esm.mjs that are distributed. These appear to be the same file:

meriyah/scripts/bundle.js

Line 18 in 15f426f

await copyFile('./dist/meriyah.esm.js', './dist/meriyah.esm.mjs');

Distributing the same file with two different names makes the npm bundle larger whereas if meriyah.esm.mjs were used exclusively the bundle size would be smaller

[3cp]

When we enabled cjs and mjs files, the js files were kept for backwards compatibility in case users have explicitly used them.

I agree we need to clean the dist files up. But we prefer doing it together with a major version release, that would also allow us to remove more outdated files in current JS lands. For example the systemjs format files.