Defense Line Preprocessing code - SAR format

[Soujanya0506]

Summary:
This pull request introduces the Defense Line Analysis preprocessing pipeline for extracting defensive sequences and generating reproducible datasets from football tracking and event data.

The pipeline processes LaLiga tracking data and produces structured outputs that can be used for downstream analysis such as statistical evaluation, machine learning, or inverse reinforcement learning.

Key Features

• The preprocessing pipeline performs the following tasks:
• Loading tracking, event, and match metadata
• Event–tracking synchronization
• Direction normalization
• Possession change detection
• Defensive sequence extraction
• Defender identification (with optional back-four filtering)
• Defensive success/failure labeling
• State–Action–Reward (SAR) dataset generation
• Feature dataset generation