Provide logging capabilities using Terraform Logging

[Reinhard-Pilz-Dynatrace]

The Terraform Provider currently prints out debug logs into external files. It doesn't use stdout because the channel is reserved for communication between Terraform and the Provider. Within CI/CD environments, especially when Terraform is getting executed within a Container, it's however difficult to get to such log files.

Solution: Utilize Terraform Logging capabilities so that Terraform would be able to capture the output and dump them onto stdout.

[Reinhard-Pilz-Dynatrace]

Minimum goal should be to produce optionally HTTP traffic within Terraform logs (in addition to the external log file).