Add latestCommittedWriteRegion ReadConsistencyStrategy

[jeet1995]

Summary

The CosmosClient instance should be able to route read requests to the write region and perform quorum reads against that write region.

Details

Add a new latestCommittedWriteRegion value to the ReadConsistencyStrategy enum that:

• Routes read requests to the current write region
• Performs quorum reads against that write region
• Ensures reads reflect the latest committed writes

Motivation

This enables strong consistency reads by targeting the write region directly, avoiding cross-region replication lag.