Switch to HTTP API or different SDK for Azure

[simoneb]

The current Azure SDK doesn't support all operations we need to do, specifically it doesn't support certain parameters we use for pagination. It forces us to use lower-level operations which are not future-proof.

We should consider switching to a more robust approach for interacting with Azure APIs, either straight HTTP or a better SDK. There is a chance that there is a more recent SDK to use, otherwise HTTP is fine too.

We are doing some HTTP interactions with Azure in Titus, if that's of any help: https://github.com/nearform/titus/blob/master/packages/titus-backend/lib/plugins/auth/azure-ad/index.js

[simoneb]

See update in #30