Option to display timing and token usage without verbose debug logs

Currently, the CLI has an all-or-nothing approach for displaying additional information:

• verbose false: No timing or token usage displayed
• verbose true: Shows timing/tokens BUT also shows all debug logs

Expected Behavior:
Users should be able to see timing and token usage information without being flooded with
verbose debug logs.

Current Workaround:

• Use /cost command periodically, but this doesn't show timing
• Enable verbose mode and tolerate all the extra logs

Suggested Solution:
Add a separate config option like show_metrics or make timing/token display independent
from verbose logging.

Use Case:
Many users want to monitor their usage and performance without needing full debug output
for troubleshooting.