refactor: migrate codebase to pure esm

[hardfist]

we migrate lots of webpack's internal code which is commonjs format, which may cause some interop issue with rspack's esm code and is not good for treeshaking if we bundle rspack's code.
we should migrate all existing commonjs code to esm
notice that we do migrate to esm module other than strict esm module during this refactor which means we still compiles all code to commonjs

strict esm maybe supported in 2.0