Better data type specification

Hello and congratulations with finally providing an MS-developed Python SDK for Dataverse!

I must admit I found the press release a bit humorous - this is not new functionality in Python. I have created and maintained such a library for a few years now, which is used in production workloads for projects I am working on in Aker BP.

I do think it's fantastic to have more development power behind such an SDK, and I will look into this every now and then to see if my old "junk" is ready to be replaced! 😎

Anyway, looking through the code it immediately jumps out that specifying a string column (for instance) creates a column with a 200 character limit, with no way of specifying the max length. Same with other data types, you cannot influence min/max for a numerical column. I think this would be a good addition. I do love the enum-coercion for choice type columns, I haven't implemented this yet in my own framework!