DataType.of should be non case sensitive

[rnett]

Currently DataType.of only accepts uppercase names like FLOAT32. Anyone used to using python will expect float32 and similar lowercase names to work. It seems like it may have been a design decision by it's inclusion in the docs, but I don't see a reason not to add it (probably as a toUppercase on the arg rather than extra cases) and I expect almost everyone will run into this at some point.

[rnett]

This will likely be fixed by #139 if DataType gets converted to an enum.

[karllessard]

Hi @rnett , I was about to say so, SIG JVM have agreed to go forward with #139, which leverages even more Java idiomatic type features in preference to a custom or pythonic type system.

I suggest we close this issue so that you can continue to provide your valuable feedbacks on the next PRs to come that will be related to this

[rnett]

Agreed.