feat: add ms-python.black-formatter

[yajo]

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Description

According to microsoft/vscode-black-formatter#176, Black support will start moving out from ms-python.python into this new extension.

[filiptronicek]

Thanks a lot for the contribution, @yajo 🧡! I took the liberty to update the PR to include the necessary Python libraries as per the project's contribution guidelines.

Should be good to go.

[filiptronicek]

Published 🎉 [1]