Modify Intersect operator

[pklpriv]

In this PR Intersect() operator is updated. It allows us to filter out some values from data when running benchmarks. Additionally, test were updated and rewritten for more readability.

[elronbandel]

Two issues:
(1) This is not backward compatible, what if anyone using it now?
(2) The same behavior can be achieved with current implementation:
Intersect(field_to_field={"label": "label", "name": "name"}, allowed_values=["b", "f"])

Am I missing something?

[yoavkatz]

Two issues: (1) This is not backward compatible, what if anyone using it now? (2) The same behavior can be achieved with current implementation: Intersect(field_to_field={"label": "label", "name": "name"}, allowed_values=["b", "f"])

Am I missing something?

This relates to a need (e.g in ner datasets) to filter multiple fields together ( e.g keep only two entity types and remove the start ,end, and label fields).

The current code changes are not backwards compatible (e.g hard code the field to " labels").

I'll write more details later on how to address.