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Restore CJS support for Node versions before 20

In 2.0.0 I dropped CJS support because `require(esm)` is supported by
default in v20.19.0, and `import` syntax even works in `v12.17.0`.

Despite anything earlier than 20 being EOL (and 20 itself going EOL next
month - https://nodejs.org/en/about/previous-releases ), some downstream
packages still want to support older Node versions.

This restores CJS support for versions as low as Node 10. Older versions
are unsupported due to the absence of the URL global in older versions.

index.cjs is a copy of index.cjs, except using CJS exports instead of
ESM exports. These files should be kept in sync until we drop CJS
support again.

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