Auto-generate DWARF debug symbols in debug builds

[JoshuaBatty]

Description

DWARF debug symbols are now automatically generated and saved as debug_symbols.obj in the output directory when using debug builds. This enables better debugging support out of the box in development without requiring the -g flag. The -g flag is still supported for specifying custom debug symbol output paths or generating debug symbols in other build profiles.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[codspeed-hq]

CodSpeed Performance Report

Merging #6863 will not alter performance

_{Comparing josh/save_dwarf (9dc47b5) with master (b03c76e)}

Summary

✅ 22 untouched benchmarks

[zees-dev]

LGTM 👍