Migrate from the SDK to the 'framework'

[OJFord]

Off the top of my head (mobile) I think I might even still be using v1 of the SDK - should just skip over v2 and use the framework as Hashicorp recommends for new projects: https://www.terraform.io/plugin/framework

Came across this earlier via stumbling across the official 'tflog', which should also start to use (even if just a 'hello world' type debug log at first, just to integrate it) as part of this.