Support asset configuration similar to Angular api

[zargham-k]

Hi,
I am trying to migrate an existing application to rsbuild. How do you recommend to workaround asset configuration provided by angular. The input and output directories are structured differently e.g:

{
 "glob": "**/*",
 "input": "node_modules/monaco-editor",
 "output": "/assets/monaco-0.39/monaco/"
}

Thank you.