Fix pickling of VanillaDataManager #2129
Merged
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This PR changes the VanillaDataManager impl. to make the classes truly generic.
It fixes #2102, #1868 (comment).
Note: it uses features available in Python>=3.8, it would totally break for older pythons.
When implementing #1868, we choose a simpler class_getitem impl. over the original implementation suggested in the first commit of #1868. But the simpler impl. breaks pickling support and causes errors in other places (restored yaml objects are not generic). This PR reverts the original implementation.