Update notebooks and solutions 8.2.18

[RizwanMunawar]

@glenn-jocher I have updated both notebooks (object counting and heatmaps). Object tracking notebook does not require any changes.

FYI, I have not changed any design or comments in notebooks, except the code lines that was required to be changed. I have also performed testing of notebooks and these are working fine. Thanks :)

Note: PYPI package was not publish in last PR, so added that, not sure If that will work :)

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Simplification and Enhancement of Heatmap and Object Counting Examples 🚀

📊 Key Changes

• Code Simplification: Import statements for YOLO and solutions (heatmap, object counter) are combined into a single line, reducing clutter.
• API Enhancement: Heatmap and Object Counter instantiation now utilize the simplified solutions namespace, streamlining their usage.
• VideoWriter Syntax: Consolidated cv2.VideoWriter instantiation to a single line to improve readability.
• Heatmap Customization: Introduced direct passing of model names for class labels, enhancing heatmap labels customization.
• ObjectCounter Updates: Additional arguments such as line_thickness improve visual output customization for object counting.

🎯 Purpose & Impact

• For Developers: Simplifies code and encourages the use of the solutions namespace for a cleaner, more efficient coding experience.
• For Users: Enhancements in visual outputs (heatmaps, object counting) offer improved analytics and interpretations of video data.
• Overall Impact: These updates aim to make it easier for users to generate high-quality visual analyses with minimal coding effort, potentially leading to broader adoption and innovative applications of Ultralytics solutions.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.93%. Comparing base (fceea03) to head (bf0104a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12796 +/- ## ======================================= Coverage 70.93% 70.93% ======================================= Files 123 123 Lines 15563 15563 ======================================= Hits 11039 11039 Misses 4524 4524 ``` | [Flag](https://app.codecov.io/gh/ultralytics/ultralytics/pull/12796/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ultralytics) | Coverage Δ | | |---|---|---| | [Benchmarks](https://app.codecov.io/gh/ultralytics/ultralytics/pull/12796/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ultralytics) | `35.66% <100.00%> (ø)` | | | [GPU](https://app.codecov.io/gh/ultralytics/ultralytics/pull/12796/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ultralytics) | `37.46% <100.00%> (+0.01%)` | :arrow_up: | | [Tests](https://app.codecov.io/gh/ultralytics/ultralytics/pull/12796/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ultralytics) | `66.97% <100.00%> (-0.09%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ultralytics#carryforward-flags-in-the-pull-request-comment) to find out more.

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[glenn-jocher]

@RizwanMunawar thanks for the updates! Since it's hard for me to update your fork directly I'm merging into a local branch and updating there :)