Add entity_list create and add_property

[lognaturel]

Will be supported when Central v2024.1 is released.

getodk/central#575

getodk/central#576

[lognaturel]

@lindsay-stevens this has come up as something that someone wants to do so might be a good one to take on first!

[yanokwa]

An example script would be super helpful. Maybe something that takes a CSV from a imported_answers.csv with headers like submission_id, q1, q2, q3, and creates an entity list called previous_survey with the q1-q4 properties and creates entities accordingly.