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

[ttnghia]

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.

[ttnghia]

CC @bdice for awareness.

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[GregoryKimball]

sometimes we actually need to support strong types in these self- operations

@ttnghia would you please elaborate on this use case? What code changes would you propose?

This issue references competed work in #10730

[ttnghia]

The use cases already existed, and implementation of this FEA was added here:

• https://github.com/rapidsai/cudf/blob/7d173c9d144a64c5e1a0467d2a5eb4181854f25e/cpp/src/search/contains_table.cu#L65
• https://github.com/rapidsai/cudf/blob/7d173c9d144a64c5e1a0467d2a5eb4181854f25e/cpp/src/search/contains_table.cu#L83

I proposed this issue and already made a draft PR but that was not approved so I had to implement it locally only in that file.