NamedOperations and Operation Chains do not accept multiple inputs

[j8934893]

The GetElementsBetweenSets operation requires both an input and input_b.

However, if this operation is nested within an operation chain and defined as a named operation there is no way to pass in input_b.

This addition would be required for future inclusions of operations such as: GetShortestPaths, GetWalksBetween etc. that would require multiple inputs.

The option to provide an input map with multiple input sets/collections might cover this.

Possibly something that would need to wait for v2.