Supplying nnbench.Transforms directly to record IO

[nicholasjng]

TL,DR: I would like to replace this pattern:

record = runner.run(__name__, params={...})
transform = MyTransform()
trecord = transform.apply(record)
FileIO.write(trecord)

with this:

record = runner.run(__name__, params={...})
FileIO.write(record, *, transform=MyTransform())

Meaning that a single transform can be given and applied to a record in a write() / read(), similarly in other IO types we have.