[FEATURE] Migrate AWS Elasticache Service to AWS SDK v2

[aimethed]

Subtask of #1960

In order to update the federation sdk and connectors to AWS SDK v2, each service must be migrated. This issue is to migrate Elasticache to v2. This is done by removing the dependency on Elasticache v1, adding the dependency for v2, and then updating all uses in the codebase to v2.

See the AWS docs guide: https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/migration.html