fix: esm module export

pull request #821

test: add reproduction repo for module export

Repo is copied from #816 inside to test in future

fix(all-settled): bundler esm import
fix(async): bundler esm import
fix(core-v1): bundler esm import
fix(core): bundler esm import
fix(effects): bundler esm import
fix(eslint-plugin): bundler esm import
fix(form-web): bundler esm import
fix(form): bundler esm import
fix(framework): bundler esm import
fix(hooks): bundler esm import
fix(jsx): bundler esm import
fix(lens): bundler esm import
fix(logger): bundler esm import
fix(npm-cookie-baker): bundler esm import
fix(npm-history): bundler esm import
fix(npm-lit): bundler esm import
fix(npm-react): bundler esm import
fix(npm-solid-js): bundler esm import
fix(npm-svelte): bundler esm import
fix(npm-vue): bundler esm import
fix(persist-web-storage): bundler esm import
fix(persist): bundler esm import
fix(primitives): bundler esm import
fix(react-v1): bundler esm import
fix(testing): bundler esm import
fix(timer): bundler esm import
fix(undo): bundler esm import
fix(url): bundler esm import
fix(utils): bundler esm import
fix(web-fetch): bundler esm import
fix(web): bundler esm import

Reatom used to use package.json#module field to declare esm modules.
Turns out it was only in draft spec and never was standardized.
So instead of relying on non-standard behaviour we use .mjs which is
standard nodejs mechanizm.

Should fix #816 #806 #573

fix(new-package-template): use mjs in module export

test: implement cjs and esm check test

chore: install test files