[lldb] Highlight basenames in backtraces (#137301)
Also changes the PC value color so it doesn't visually clash with the
function names
Before:
<img width="1510" alt="Screenshot 2025-04-25 at 10 38 58 AM"
src="https://github.com/user-attachments/assets/1ec35ba3-a3d9-4e5b-bac9-fc738bfe6d25"
/>
After:
