Consider documenting API Requirement to use Cloud Resource Manager API

[AaronME]

What problem are you facing?

I created the following resource:

apiVersion: cloudplatform.gcp.jet.crossplane.io/v1alpha1
kind: ProjectIAMBinding
metadata:
  name: secret-service-account-binding
spec:
  deletionPolicy: Delete
  forProvider:
    members:
      - serviceAccount:<serviceaccount>@xxx-xxx-xxx-xxx.iam.gserviceaccount.com
    project: xxx-xxx-xxx-xxx
    role: roles/secretmanager.secretAccessor
  providerConfigRef:
    name: default

I received an error:

        create failed: cannot apply: apply failed: Request `Set IAM Binding for
        role "roles/secretmanager.secretAccessor" on "project
        \"xxx-xxx-xxx-xxx\""` returned error: Error retrieving IAM policy
        for project "platform-core-initial": googleapi: Error 403: Cloud
        Resource Manager API has not been used in project 123456789 before or
        it is disabled. Enable it by visiting
        https://console.developers.google.com/apis/api/cloudresourcemanager.googleapis.com/overview?project=123456789
        then retry. If you enabled this API recently, wait a few minutes for the
        action to propagate to our systems and retry.

I had to enable cloudresourcemanager.googleapis.com to use the ProjectIAMBinding resource.

How could GCP Provider help solve your problem?

Document dependency on cloudresourcemanager api for cloudplatform iam bindings.