* Add chunk reading functionality to FileReadTool
- Added start_line parameter to specify which line to start reading from
- Added line_count parameter to specify how many lines to read
- Updated documentation with new parameters and examples
* [FIX] Bugs and Disscutions
Fixed: start_line negative value
Improved: File Reading Operations
* [IMPROVE] Simplify line selection
* [REFACTOR] use mock_open while preserving essential filesystem tests