[TRACKING ISSUE] Ability to specify multiple partitions in a predicate query (redux)

The tracking issue for the Java side PR.

See https://github.com/hazelcast/hazelcast/pull/21319 for details.

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This is a redux of [PR-18171](https://github.com/hazelcast/hazelcast/pull/18171). I'm continuing on from @ashley-taylor.

I've gone with a slightly different approach of making a backwards compatible change to the existing `PartitionPredicate` interface (instead of making an entirely new interface). This seemed lower risk as existing code with single partition keys will continue to work, while anything new can take advantage of the `getPartitionKeys` method.

Breaking changes (list specific methods/types/messages):
* PartitionPredicateImpl constructor

Checklist:
- [x] Labels (`Team:`, `Type:`, `Source:`, `Module:`) and Milestone set
- [ ] Label `Add to Release Notes` or `Not Release Notes content` set
- [ ] Request reviewers if possible
- [ ] Send backports/forwardports if fix needs to be applied to past/future releases
- [ ] New public APIs have `@Nonnull/@Nullable` annotations
- [ ] New public APIs have `@since` tags in Javadoc

Empieza por el PR 21319 enlazado y su predecesor referenciado, PR-18171; este tracking issue no indica archivos ni pruebas. Confirma si el cambio del lado de Java ya está completo y si queda trabajo pendiente en el cliente de Python antes de encargarte de ello.

Escrito por el modelo de indexación a partir del texto del issue.