Support for AWS gp3 EBS PersistentVolumes in OCP 4

Issue

• In December 2020, AWS announced the availability of gp3, general purpose SSD volumes for Amazon EBS. Can these volumes be used for PersistentVolumes in OCP 4?

• When creating a new PersistentVolumeClaim for a StorageClass with type: gp3, provisioning fails with the following error message:

  failed to provision volume with StorageClass "gp3-csi": rpc error: code = Internal desc = Could not create volume "pvc-231a4782-e22c-4c52-952d-950da6ae8e79": invalid AWS VolumeType "gp3"
  

• The aws-ebs-csi-driver-controller Pod shows the following errors:

  E0107 12:51:46.862390       1 driver.go:111] GRPC error: rpc error: code = InvalidArgument desc = Invalid parameter key iops for CreateVolume
  E0107 12:52:49.800534       1 driver.go:111] GRPC error: rpc error: code = Internal desc = Could not create volume "pvc-231a4782-e22c-4c52-952d-950da6ae8e79": invalid AWS VolumeType "gp3"