Weighted Average for Phase Stats

[ArneTR]

(improvement): Phases Stats for CPU Utilization etc. now have weighte…

Greptile Summary

Implemented weighted average calculations for phase statistics in the Green Metrics Tool, improving the accuracy of metrics like CPU utilization by accounting for time intervals between measurements.

• Added weighted average calculation in phase_stats.py using LAG time differences for more accurate metrics
• Implemented classic average fallback when fewer than 3 measurements exist
• Modified SQL query to include ORDER BY clause ensuring correct LAG calculations
• Updated test values in test_phase_stats.py to reflect new weighted averaging (e.g. CPU utilization from 1985 to 1983)
• Converted all weighted averages to Decimal type for consistent precision handling

[greptile-apps]

LGTM

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[greptile-apps]

LGTM

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