textlint-script: support ESM outputs

[azu]

Current textlint-scripts build output CJS.
However, textlint v13.0.0 support native ESM rule.

textlint-scripts need to support ESM outputs.

Proposal A

Add textlint-scripts-esm and textlint-scripts --esm like ts-node

• Require to output .mjs because package.json may not have type=module

Proposal B

If package.json has type=module, textlint-scripts output ESM

• Require to run npm pkg set "type"="module" before using textlint-scripts

Note 📝

• Use "exports": "./src/index.js" instead of main
• Use ts-node/esm instead of ts-node
• Need to update template repository
  • Should We use ESM by default?

[azu]

textlint-scripts test transpile js on the fly.
It requires babel loader.

• Blocker: feat: add esm experimental-loader support to @babel/register babel/babel#15456
• Related: giltayar/babel-register-esm: Node.js ESM loader similar to babel-register

📝 We can run tests without loader in js mode beause babel only transpile ES2015+ syntax.
However, in ts mode, we need to get loader like babel loader or ts-node/esm

[azu]

Customization Hooks is RC.