Rspack compatibility

[KrzysztofZawisla]

Would be nice to make it compatible with rspack

[bigbossx]

anything update?

[kgram]

I have implemented this in #37. Until this is published, you can use github:kgram/preload-webpack-plugin#634a6b726429ab486be1cd08df43a44496db9e77 as source instead.