feat: support cjs extension for config

[leonsilicon]

When using Maizzle in a project with "type": "module", the configuration file config.js is treated like an ESM module, which causes an error (since it's written in CommonJS). To fix this, it should be renamed to config.cjs, but it doesn't seem like Maizzle supports this just yet (since it relies on Node's auto-extension resolution algorithm, which doesn't work for the .cjs extension).

This PR just adds some explicit checks for .cjs files in the configuration loader so that Maizzle correctly loads configuration files that end with a .cjs extension.

Let me know if you have any questions!

[cossssmin]

Hey, thanks so much for this, could you please direct it at the next branch instead, so we can include it in the upcoming 4.4.0 feature release?

[cossssmin]

Thanks!