source map fixes (#61723)
### What?
* show guessed original file for generate code
* avoid internal cast
* add get_source_map method
* hide turbopack runtime stack lines
* hide unmapped stack lines
Closes PACK-2400
Before:
After:
and expanded:
### Other Turbopack changes
* https://github.com/vercel/turbo/pull/4235 <!-- Leah -
chore(turborepo-lib): use compile error for feature validation -->
* https://github.com/vercel/turbo/pull/7285 <!-- Tobias Koppers -
resolve source maps that are attached in source code -->
* https://github.com/vercel/turbo/pull/7301 <!-- Donny/강동윤 -
fix(turbopack): Reverse order of css chunks to fix css module issues -->
* https://github.com/vercel/turbo/pull/7286 <!-- Tobias Koppers - guess
original source for generated code -->
