Add Support for Kinesis SubscribeToShard

[aajtodd]

Describe the feature

Add support for Kinesis SubscribeToShard event stream operation.

This requires adding support for RPC protocols where the initial request/response comes from the event stream rather than the HTTP request/response.

See also #543

Is your Feature Request related to a problem?

N/A

Proposed Solution

N/A

Describe alternative solutions or features you've considered

N/A

Acknowledge

• I may be able to implement this feature request

AWS Kotlin SDK version used

N/A

Platform (JVM/JS/Native)

N/A

Operating System and version

N/A

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