[Feature Request]: extend onResolve plugin hook to include import attributes in import-statement

[barak007]

esbuild is not strong in splitting chunks. some related issues (#16, #207, #1781, #2208, #2227, #2419)

if the onResolve hook would have the entire import information a plugin could implement much better splitting strategy based on native imports.

The idea is, if a plugin can collect all the imported named symbols from a specific import-statement request, it could externalize the request and generate a esm bundle (with correct exports) from a cjs/umd module like react.

my goal is to optimize large code base watch mode by externalizing modules to separate builds.