Support multi-master write Cosmos DBs

First question: is this repo still maintained? :)

If so, it should support multi-master geo-replicated Cosmos DB similar to what other language SDKs offer https://docs.microsoft.com/en-us/azure/cosmos-db/how-to-multi-master?tabs=api-async

The issue references Azure Cosmos DB multi-master write support. Examine the existing driver code to understand the current connection and request routing logic. Compare with the linked Microsoft documentation for other language SDKs to identify the required API changes. Determine how to configure and handle multiple write endpoints.

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