fix: skip transforming CommonJS files

[privatenumber]

Problem

• Node.js is unable to detect whether a .ts file is commonjs/module, and assumes all .ts files are module. This fails when there are TS files that expect to be executed in a CJS context (eg. using __dirname/__filename).

• This loader should not transform .cts files to ESM because it's technically a CJS file (with import/export syntax support). It should be able to access __filename, and therefore, must be delegated to the cjs-loader.

closes privatenumber/tsx#2

Changes

• Added package type detection, allowing TS files to be skipped if the package type is commonjs, letting cjs-loader handle transforming TS files in commonjs contexts.
• Updates core-utils to transform dynamic imports to interop with modules that have __esModule.

[privatenumber]

🎉 This PR is included in version 2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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