🏗 Use ESM to import peer Bento binaries

[alanorozco]

On module builds, use browser's import statement to share Bento dependencies like bento.mjs.

On nomodule builds, we can't use import. Instead, we use babel to output to a format similar to AMD.

This change also simplifies some aspects:

• Prefers using {remapDependencies} for esbuild rather than module-resolver on babel.
• Removes bento compile wrapper.
• Removes generators. Uses src/bento.js directly, and the intermediate bento-shared.js module is no longer needed.

[amp-owners-bot]

Hey @erwinmombay, @jridgewell! These files were changed:

build-system/babel-plugins/babel-plugin-nomodule-loader/define-template.js
build-system/babel-plugins/babel-plugin-nomodule-loader/index.js
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-default/input.mjs
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-default/options.json
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-default/output.js
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-from/input.mjs
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-from/options.json
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/export-from/output.js
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/import-default/input.mjs
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/import-default/options.json
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/import-default/output.js
build-system/babel-plugins/babel-plugin-nomodule-loader/test/fixtures/transform/imports-and-exports/input.mjs
+12 more

Hey @rsimha! These files were changed:

build-system/common/esbuild-babel.js
build-system/common/once.js

[alanorozco]

@jridgewell this should be ready for review. PTAL

[jridgewell]

Can you add a test case for a single exports default fn() {} export? Want to make sure isn't not going to do a module.exports = fn() {}.

Otherwise, LGTM.