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lib: allow CJS source map cache to be reclaimed

Rodrigo Muino Tomonari requested to merge github/fork/legendecas/source-maps/cjs into main

Unifies the CJS and ESM source map cache map and allows the CJS cache entries to be queried more efficiently with a source url without iteration on an IterableWeakMap. Reclaims the CJS cache entry with a FinalizationRegistry instead.

Add a regression test to verify that the CJS source map cache entry can be reclaimed.

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