The objective of this improvement is to add Azure Cosmos DB [2] as an unbounded source and sink for the DataStream connectors [1]

[1] https://beam.apache.org/documentation/io/built-in/
[2] https://docs.microsoft.com/en-us/azure/cosmos-db/change-feed

Imported from Jira BEAM-10440. Original Jira may contain additional context.
Reported by: iekpo.