feat(datasets) Add dataset type check for dataset assignment #4058
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Issue
The partitioner does not check if the type of the assigned dataset is as expected.
Description
This issue was not seen since, typically, the dataset assignment happens inside federatedDataset; however, if ppl use the partitioner alone (for local data), then as shown in the Slack channel, it can happen (then the error is completely non-informative).
Proposal
Add type check for the dataset assignment. Add tests for that too.