Wrap Retry Strategy

[kggilmer]

Wrap the retry strategies available in CRT.

NOTE: these are not exposed in the JNI layer yet of CRT-Java and will need to be added.

https://github.com/awslabs/aws-c-io/blob/main/include/aws/io/retry_strategy.h

internal id: 176346235

[aajtodd]

OBE, retry strategy for aws-sdk-kotlin was written in pure Kotlin