fix: explicit esm and cjs build via tsc, remove babel

[phanshiyu]

Why

Webpack in CRA cannot process cjs (see facebook/create-react-app#12700). Axios is serving cjs in current versions now because of:

      "browser": {
        "require": "./dist/browser/axios.cjs", // used to be: index.js in 1.1.2 which is esm, hence it worked
        "default": "./index.js"
      },

@zixiang2018 good find!

What

Goal: We serve CRA the esm version of our code instead of cjs

1. Build ejs and cjs
2. Configure package.json to allow target platforms to find them

Since in CRA es syntax is being used, importing dnsprove shd get it the esm version of our code, which also imports axios as opposed to require.

[github-actions]

🎉 This PR is included in version 2.7.1 🎉

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