Add async iterator over bytes in result of get

[kylebarron]

This is super cool. Really excited to test this tomorrow. Original credit goes to @timteeee in roeap/object-store-python#29

• Both async and sync iterators over a get result
• We should be able to do the same for list so that we return an iterator, instead of materializing the entire list result at once.
• Implementing __iter__ that returns self is something I need to do in arro3; somewhere I have to call iter() manually, or something like that.
• would also be cool if you could take in an iterator or async iterator for the delete_stream method

Tomorrow I'll add a test for this.

[kylebarron]

import boto3
import object_store_rs as obs

store = obs.store.S3Store.from_session(boto3.Session(), "ookla-open-data")
path = "parquet/performance/type=mobile/year=2023/quarter=3/2023-07-01_performance_mobile_tiles.parquet"

resp = obs.get(store, path)
async for buf in aiter(resp):
    print(len(buf))

that's super cool