Deduplicate by word in report paths

[nataliakokoromyti]

This PR adds a -dedup_by_word flag to report_checks that deduplicates bus signals in timing path reports by showing only the path with worst slack for each bus.

When reporting paths with -dedup_by_word, the feature:

• Groups endpoint pins by bus name (e.g., data[0], data[1] → data)
• Reports only the worst slack path for each bus
• Keeps all non-bus signals in the report

Usage

report_checks -dedup_by_word

Changes

- Added dedup_by_word_ boolean flag to ReportPath class
- Implemented bus name extraction using existing parseBusName() utility
- Added getBusName() helper function to extract bus names from endpoints
- Added TCL interface via -dedup_by_word flag
- Added test case path_dedup_worst

Testing

cd test
./regression path_dedup_worst