docs: seal of approval entry for mlr3

[m-muecke]

No description provided.

[tdhock]

hi @m-muecke thanks for your PR.
I believe mlr3 is a great candidate to obtain the Seal of Approval.
However before we merge this PR, please first follow these instructions:

To add your package to this list, please submit a Pull Request to The Raft, making sure to follow the templated instructions: https://github.com/rdatatable-community/The-Raft/blob/main/.github/PULL_REQUEST_TEMPLATES/seal_of_approval.md

Basically you would just have to write a short blog which explains what mlr3 does, and how it relates to data.table, like these: https://rdatatable-community.github.io/The-Raft/#category=seal%20of%20approval

By the way, you are the first person who has submitted a package for the Seal of Approval, so we would appreciate any feedback you could share about how we could improve documentation for the submission process. For example, perhaps it would be helpful to directly link the templated instructions (https://github.com/rdatatable-community/The-Raft/blob/main/.github/PULL_REQUEST_TEMPLATES/seal_of_approval.md) from https://github.com/Rdatatable/data.table/blob/master/Seal_of_Approval.md ?

[Anirban166]

LGTM!

[kbodwin]

The draft post justifying this Seal is here: https://github.com/rdatatable-community/The-Raft/blob/main/posts/2024-09-24-seal_of_approval-mlr3/index.qmd

Once this PR is merged, I will make the post live!

[tdhock]

hi @m-muecke your blog looks great to me, thanks for your contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (fcc9de2) to head (dc21d02).
Report is 1 commits behind head on master.

Additional details and impacted files

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  Coverage   98.62%   98.62%           
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  Files          79       79           
  Lines       14448    14448           
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  Hits        14249    14249           
  Misses        199      199           

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