Create list of terraform providers

[demeyerthom]

A lot of our plugins are actually only functionality to inject a provider into the terraform code. This is a bit redundant. We should instead add an option that can take a list of configurations and create the relevant terraform providers based on this.

Requirements

• Take list of configurations and generate providers
  • Should also allow for aliassing etc
• Add providers to every module where configured
• Ensure no duplication with plugins. Plugin has priority over config
• Use versions if specified