[Kinesis customization] Read timeouts

[rcoh]

GetRecords requires a read timeout to prevent the HTTP client waiting forever. Medium because controlling read timeouts might be non-trivial

[jdisanti]

Attempted to figure out the "why" for this issue. Found that it had a duplicate in smithy-kotlin that has since been resolved, and I think it originated from this Go SDK issue.

My stance on this is that since we're not going to implement a default read timeout, we don't need a customization to modify that default read timeout for Kinesis GetRecords.