fix(module): add .cjs extension

[layershifter]

Motivation

This PR adds .cjs extension to Module in v3. It's required as new version of @swc/helpers uses export maps and points files to .cjs, for example:

"./_/_class_private_field_loose_key": {
  "import": "./esm/_class_private_field_loose_key.js",
  "default": "./cjs/_class_private_field_loose_key.cjs"
},

[changeset-bot]

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Latest commit: 675c0ca

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