terraform-providers.mkProvider: init (#140465)

Expose how the providers are being created. That way, users can more
easily extend or override the list of providers that they want to use.

For example, you need a new AWS provider version:

```nix
terraform.withPlugins (p: [
  (p.mkProvider rec {
    owner = "hashicorp";
    provider-source-address = "registry.terraform.io/hashicorp/aws";
    repo = "terraform-provider-aws";
    rev = "v${version}";
    sha256 = "0fa61i172maanxmxz28mj7mkgrs9a5bs61mlvb0d5y97lv6pm2xg";
    vendorSha256 ="1s22k4b2zq5n0pz6iqbqsf6f7chsbvkpdn432rvyshcryxlklfvl";
    version = "3.56.0";
  })
])
```

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