bergjaak

### Problem Statement Currently, when using a SessionManager like the [AgentCoreMemorySessionManager](https://github.com/aws/bedrock-agentcore-sdk-python/tree/main/src/bedrock_agentcore/memory/integrations/strands), there is high latency during initialization of the SessionManager. This is because the current [SessionRepository](https://strandsagents.com/latest/documentation/docs/api-reference/session/?h=repositorysessionmanager#strands.session.session_repository) interface (which the AgentCoreMemorySessionManager...