Refactor/remove code smell too many statements

[EdivarCr]

Aqui está a versão em inglês:

<details>
<summary>Before submitting</summary>

- [x] Self-reviewed the code
- [x] Updated documentation, follow [Google-style](https://google.github.io/styleguide/pyguide.html#383-functions-and-methods)
- [ ] Added docs entry for autogeneration (if new functions/classes)
- [x] Added/updated tests
- [x] All tests pass locally

</details>

## Description

Refactored multiple functions and methods across the `supervision` library to resolve the excess of statements code smell (`too-many-statements` / `R0915`). The logic was simplified, modularized, and broken down into smaller helper functions in the following files:

- `src/supervision/tracker/byte_tracker/core.py`
- `src/supervision/metrics/mean_average_precision.py`
- `src/supervision/detection/vlm.py`
- `src/supervision/detection/utils/internal.py`
- `src/supervision/utils/video.py`
- `src/supervision/key_points/core.py`
- `src/supervision/metrics/detection.py`

## Type of Change

- 🔨 Refactoring (no functional changes)