Fix input_dist for when it has to handle KVZCH and non-KVZCH tables together for row-wise sharding #3444
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Summary:
In the KVZCH scenarios, the input_dist for row-wise sharding will have to deal with KVZCH and non-KVZCH features together. This means that the virtual_table_feature_num_buckets will have to represent non-KVZCH features too.
In this diff, we default the value of the num_buckets to world_size for non-KVZCH features.
Differential Revision: D84094039