[Feature]: improve diagnostic when resolve failed with missing resolve.extensions

[h-a-n-a]

What problem does this feature solve?

For example, if a module resolution is failed as I do import("./foo").
Then we will check the files in the current directory with name "foo" but with different extensions or the directory named "foo" with its "index" file(according to mainFiles) with different extension than preconfigured resolve.extensions. This could avoid us from setting arbitrary extensions and keep rspack as more Web-spec as possible.
Then rspack can list these suggestions in the help section of each diagnostic.

What does the proposed API of configuration look like?

NO API change.

[h-a-n-a]

To add this support, you may refer to this for details:

1. Add a new error hint helper in this file

   rspack/crates/rspack_core/src/resolver/mod.rs

   Line 70 in a4b8196

   pub fn resolve_for_error_hints(

   .
2. Add a test in packages/rspack/test/diagnostics to test out the diagnostic

[luhc228]

I want to have a try.

[hardfist]

@luhc228 thanks in advance