Pagination Support

[gotjosh]

Some providers, such as:

s3

Support parameters such as max-keys or start-after. More in the API reference

gc

Support parameters such as maxResults, pageToken and startOffset. More in the API reference

Have some support that allows us to paginate results when listing items.

Is there room/need for having the client support these? In our case, we have a need to allow client-facing APIs to iterate over 150k keys at a time and as you can expect the experience of having to iterate through all of these keys at once it's not ideal.

In reality, I don't have much data on timings hence filing #79 but I reckon I'd like to get the conversation started on wether this is something we would like to support.

To begin with, I'm open to the idea of having us support this for the three major cloud providers: GCS, AWS and Azure.

[yeya24]

I am open to support those parameters!
PR is welcomed.