[FEA] Support strong index types in other `cudf::experimental::row::` comparators and hashers

When we have multiple tables to compare, we need strong index types. On the other hand, when we just do one table operations like comparing or hashing rows of the same table, we typically don't need these strong types.

However, sometimes we actually need to support strong types in these self- operations. For example, we create a hash map with strong index types. In such cases, row comparator and hasher need to operate on strong index types.