added partial support for ListShards

[oriy]

(https://docs.aws.amazon.com/kinesis/latest/APIReference/API_ListShards.html)

• supports listing given StreamName only (NextToken and StreamCreationTimestamp unsupported)

[asottile]

Probably needs a rebase, there's a conflict now

[oriy]

@mhart please review this api call is essential for AWS KCL workflow

[buremba]

The newer versions of AWS KCL library uses this API so it's not possible to use Kinesaline for KCL without ListShards API support.

[mhart]

Thanks for starting this off! Added some more tests and validation and published as v1.13.0

[oriy]

Thanks Brilliant

[kailashhd]

Thanks @mhart and @oriy.