ENH: populate Time and Position in SessionResults for practice sessions (issue #918)

[arpan2004]

Summary

Time column was NaT when fetching results for FP sessions. Populated Time column for FP sessions and sorted Position column by Time. Closes #918

Changes

• Added _PRACTICE_LIKE_SESSIONS tuple constant to Session.__init__ (for both pre-2024 and 2024+ branches) containing 'Practice 1', 'Practice 2', 'Practice 3'
• Added Session._calculate_practice_like_session_results() method that computes Time (each driver's best valid lap time) and Position (ranked by time) and writes them into session.results for practice sessions.
• Called _calculate_practice_like_session_results() from Session.load() alongside existing qualifying and race result calculations
• Updated SessionResults docstring: Position now mentions practice sessions; Time now distinguishes between race-like sessions (total race time) and practice sessions (best lap time)
• Added test test_practice_session_results_time_and_position verifying Time and Position are populated and correctly ordered for a practice session
• Added changelog entry to docs/changelog/current.rst

Usage

session = fastf1.get_session(2024, "Silverstone", "FP1")
session.load(telemetry = False, weather = False)

print(session.results[["Abbreviation", "Position", "Time"]])

Checklist

• Code follows the project's coding conventions
• Successfully populates Time and Position columns and sorts accordingly by best time

AI Disclosure

Claude Code was used as a coding assistant. The human author reviewed all AI-generated code and changes.