Add MemoryClient for AgentCore Memory

[Hweinstock]

Description

The TypeScript SDK currently has no support for AgentCore Memory. Customers need a client that provides a convenient interface over the Memory control plane and data plane APIs, similar to what exists in the Python SDK.

Motivation

Today, customers must use the raw AWS SDK clients (@aws-sdk/client-bedrock-agentcore and @aws-sdk/client-bedrock-agentcore-control) directly. This means managing two separate clients, knowing which operations belong to which plane, and writing their own polling/pagination helpers for common workflows like waiting for memory creation or retrieving conversation turns.

Acceptance Criteria

• Customers can create, read, update, and delete memories
• Customers can create events, list events, and retrieve memory records
• Integration tests run in CI against a real AgentCore Memory resource
• Module is exported from the package and documented with usage examples