feat: Adding Send and Ack Mutation Support for Cloud Spanner Queue

[finn-the-coder]

Added new mutation type for cloud spanner queue. Send and Ack Mutation API is added.
UTs and IT are added to verify e2e functionalities in cloud-devel environment only since the queue feature is not fully enabled yet.

[gemini-code-assist]

Summary of Changes

Hello @finn-the-coder, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new functionalities to Cloud Spanner by adding support for queue operations. It includes the necessary mutation types and builder classes to send and acknowledge messages in a queue. Comprehensive tests have been added to ensure the reliability and correctness of the new features within the cloud-devel environment.

Highlights

• New Mutation Types: Introduces SEND and ACK mutation types for Cloud Spanner queues, enabling message sending and acknowledgement functionalities.
• Builder Classes: Adds SendBuilder and AckBuilder classes to facilitate the construction of SEND and ACK mutations, respectively.
• Unit and Integration Tests: Includes unit tests and integration tests to verify the end-to-end functionality of the new queue features, specifically within the cloud-devel environment.

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[gemini-code-assist]

Code Review

This pull request introduces support for SEND and ACK mutations for Cloud Spanner queues. The changes include new Op types, builders for creating these mutations, and updates to the serialization logic. The accompanying unit and integration tests are comprehensive and verify the new functionality. The implementation is solid, but I have a couple of minor suggestions to improve code correctness and adherence to Java coding conventions.