Add retries (and extend timeout?) for `get_transformation_results`

[ponyisi]

Right now get_transformation_results has no retries set up, so if it doesn't get a response within the default timeout (5s) it will raise an exception and terminate the downloads for a transformation. It should use the same retry setup as the more resilient calls (e.g. get_transforms) and I would also suggest have its timeout raised (a la submit_transform).

Relevant code:

ServiceX_frontend/servicex/servicex_adapter.py

Line 292 in 2dee3c5

async def get_transformation_results(