Initial implementation of the Azure Storage Output Connector

The community decided that it can be very useful to add an Azure Storage output connector for content migration purpose.

There three different supported modes: blob, file and data disks.

Here an useful introduction:
https://docs.microsoft.com/en-us/azure/storage/storage-introduction

We will use a Java API for dropping contents using the Azure Storage API:
https://docs.microsoft.com/en-us/azure/storage/storage-samples-java

Managing accounts using the Azure SDK:
https://github.com/Azure-Samples/storage-java-manage-storage-accounts

For testing purpose we can also use the Azure Storage Explorer:
https://docs.microsoft.com/en-us/azure/vs-azure-tools-storage-manage-with-storage-explorer