I wanted to provide an update to my findings in case anyone may have the same questions as I did.
I was able to successfully install the boto3 library using information I found on StaSH. Once I had that installed, I executed
pip install boto3
Once that completed and I restarted Pythonista, the library imports successfully and is usable.
I'm very excited to be able to work on out AWS services now from my iPad. I think this will be awesome.