Move to the official AZ provider

[xescugc]

Abstract

For the #151 we had to have all CP to the v2 of the TF-SDK but AZ did not (and did not accept a PR for it) so we has to fork it and so we have github.com/cycloidio/terraform-provider-azurerm.

Right now AZ is already supporting TF-SDK/v2 so we should use the official lib instead of our fork.

Proposal

Use the official lib instead of our fork.

Implementation

For what I've checked they still import the v1 but I think it'll not cause any issues.

Open issues (if applicable)