Azure Managed Identity support for Debezium [DBZ-8274]

Migrated from [DBZ-8274](https://issues.redhat.com/browse/DBZ-8274)

h1. Feature request or enhancement

For feature requests or enhancements, provide this information, please:
h2. Which use case/requirement will be addressed by the proposed feature?
I am using the Debezium connector (specifically debezium/connect:2.7 docker image) with deployment on Kubernetes. 
My use case involves Debezium connecting to
1. Azure SQL Server as the source of change log messages
2. Azure Event Hub as a substitute for Kafka queues
3. Azure Blob storage for storing Debezium tracking metadata

All of these 3 connections currently are established via connection strings. But as the security measures get more stringent in my organization, we need to migrate to connections based on {*}Azure Managed Identity{*}. But Debezium currently does not support it natively for any of the mentioned connection types.

Hence, Feature request involves adding Debezium support for connection based on Managed Identity for Azure resources.