[WIP] Benchmark downloader

[JulienT01]

Tools to download some benchmark.

linked to the issue : #395

Checklist

• My code follows the style guideline
  To check :
  black --check examples rlberry *py
  flake8 --select F401,F405,D410,D411,D412 --exclude=rlberry/check_packages.py --per-file-ignores="init.py:F401",
• I have commented my code, particularly in hard-to-understand areas,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works,
• New and existing unit tests pass locally with my changes,
• If updated the changelog if necessary,
• I have set the label "ready for review" and the checks are all green.

[github-actions]

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The build of the doc succeeded. The documentation preview is available here:
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[JulienT01]

tool to download from here : https://github.com/DLR-RM/rl-trained-agents/tree/ca4371d8eef7c2eece81461f3d138d23743b2296

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[TimotheeMathieu]

LGTM. Maybe you could add an example in the example folder with download of benchmark + comparison with compare_agents_data ? And/or replace the data being compared in the user guide with for the comparison user guide page with data from benchmark?

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr

[github-actions]

Hello,
The build of the doc succeeded. The documentation preview is available here:
https://rlberry-py.github.io/rlberry/preview_pr