[FEATURE] Add token count and cost estimation to dry run mode

[adeeshperera]

The current dry run mode (--dry-run) only shows basic statistics like line count and character count. It doesn't provide crucial information for cost planning such as:

• Estimated token count for the LLM API call
• Estimated cost based on the selected provider
• Processing time estimates

This makes it difficult for users to understand the cost implications before making actual API calls.

[DFanso]

You can work on this @adeeshperera

[adeeshperera]

Sure!