split out interceptors (#2639)

## Motivation and Context
- split out interceptors from config bag to simplify orchestrator

## Description
- update runtime plugin trait to split out interceptors
- remove interceptor generics 
- update interceptors struct to remove locking and indirection

## Testing
- [x] ```./gradlew :aws:sra-test:assemble && (cd
aws/sra-test/integration-tests/aws-sdk-s3 && cargo test)```



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Co-authored-by: Zelda Hessler <zhessler@amazon.com>