[FEA] Enable intermediate memory allocations in groupby
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feature request
Python
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- C++
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Description
**Is your feature request related to a problem? Please describe.**
With the new numba runtime support available as of #18770, it should be possible for us to enable groupby operations that involve storing intermediates inside of UDFs.
**Describe the solution you'd like**
We should enable that functionality to expand the set of UDFs that users can leverage with cudf.
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