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ENH: Add timeit function for multiple runs timing with statistics (#794)

* Initial plan

* Implement Timer multiple runs enhancement with runs parameter

Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>

* Add time_run() context manager for multiple runs mode

- Implement time_run() method that returns a context manager for timing individual runs
- Allow usage pattern: with Timer(runs=5): for i in range(5): with timer.time_run(): ...
- Enhanced __exit__ to compute statistics when all runs are completed in context manager mode
- Add comprehensive tests for new time_run functionality
- Maintain full backward compatibility with existing timeit() method and single run mode

Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>

* Simplify Timer API by removing time_run() method

- Remove _RunTimer class and time_run() method as requested
- Context manager now only supports single runs (runs=1)
- Multiple runs only supported via timeit() method
- Update tests to reflect simplified API
- Maintain full backward compatibility for existing usage patterns

Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>

* Implement timeit function as requested - revert Timer to original simple form and add separate timeit function

Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>
Co-authored-by: Matt McKay <mmcky@users.noreply.github.com>

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