Improve fishbowl's generation of helper functions

[t92549]

As described in #8, a lot of gafferpy classes have "helper functions", that effectively wrap some inputs for the user to make gafferpy easier to use.
With fishbowl's addition into gafferpy, a lot of these were lost and needed to be added back manually.
However, fishbowl could use the type of a parameter to generate helper functions.

For example, where the operation details endpoint states the input parameter has:
"className": "uk.gov.gchq.gaffer.data.element.Element[]"
This could automatically wrap a single Element into a list, and even wrap single values in EntitySeeds.

As well as this, Element's properties could be wrapped in types depending on the schema.

[t92549]

Another example of this is GetElementsBetweenSetsPairs (see docs).

Once this has been updated, we should update the docs.