Misc: add more information to the statistics output

[ruben-arts]

Adds the following output to the notebook:

Summary for base_timings.csv:
- Average Solve Time: 1.40 seconds (mean of all durations)
- Median Solve Time: 0.47 seconds (middle value when sorted)
- Standard Deviation: 3.26 seconds (spread of durations around the mean)
- Minimum Solve Time: 0.00 seconds (shortest solve duration)
- Maximum Solve Time: 50.00 seconds (longest solve duration, capped at 50s)
- 25th Percentile: 0.14 seconds (25% of solves were faster than this)
- 75th Percentile: 2.03 seconds (75% of solves were faster than this)
- Number of Outliers: 3 (solves capped at 50s)

Summary for timings.csv:
- Average Solve Time: 0.83 seconds (mean of all durations)
- Median Solve Time: 0.35 seconds (middle value when sorted)
- Standard Deviation: 2.95 seconds (spread of durations around the mean)
- Minimum Solve Time: 0.00 seconds (shortest solve duration)
- Maximum Solve Time: 50.00 seconds (longest solve duration, capped at 50s)
- 25th Percentile: 0.11 seconds (25% of solves were faster than this)
- 75th Percentile: 0.89 seconds (75% of solves were faster than this)
- Number of Outliers: 3 (solves capped at 50s)

Comparison between the datasets:
- Average Solve Time: 'timings.csv' was 1.68 times faster than 'base_timings.csv'
- Median Solve Time: 'timings.csv' was 1.33 times faster than 'base_timings.csv'
- 25th Percentile: 'timings.csv' was 1.22 times faster than 'base_timings.csv'
- 75th Percentile: 'timings.csv' was 2.28 times faster than 'base_timings.csv'
- Outliers: 'timings.csv' had 0 fewer solves capped at 50s