Summary of Changes

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This pull request focuses on optimizing database index performance by transitioning key identifier generation mechanisms from UUIDv4 to UUIDv7. By leveraging the time-ordered nature of UUIDv7, the changes aim to reduce the overhead associated with index rebalancing during data insertions, leading to more efficient data storage and retrieval. It also includes a minor cleanup in UUID generation for JSON-RPC requests.

Highlights

• Migration to UUIDv7 for Core IDs: Several identifier generation functions, including NewMessageID, NewTaskID, NewContextID, and NewArtifactID in a2a/core.go, as well as newID() in a2asrv/push/store.go, have been updated to generate UUIDv7 instead of UUIDv4.
• Improved Index Performance: The primary motivation for adopting UUIDv7 is to enhance the efficiency of database index updates. UUIDv7's time-based prefix ensures that new IDs are generally increasing, which can significantly reduce index rebalancing operations on insertion compared to random UUIDv4s.
• New Helper Function for UUIDv7: A new private helper function, newUUIDString(), has been introduced in a2a/core.go to centralize and encapsulate the logic for generating UUIDv7 strings.
• Minor UUID Generation Refactor: In a2aclient/jsonrpc.go, the method for generating UUIDs for JSON-RPC request IDs was simplified from uuid.New().String() to uuid.NewString(). This change is a minor refactor and continues to use UUIDv4, not UUIDv7.