chore: enforce the use of extensions for all the imports in src files

[dario-piotrowicz]

Most of the imports in src files do include the .js extension, only some don't for some reason (those are likely unintentional), for consistency I think all imports should include .js extensions

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commit: b3eeaac

[dario-piotrowicz]

Thanks for the reviews 😄 🙏