feat: Support specify annotations for cloud environments

[ciiiii]

resource "streamnative_cloud_environment" "test" {
  cloud_connection_name = "test"
  region = "us-east-1"
  organization = "test"
  environment_type = "dev"
  network {
    cidr = "10.0.0.0/16"
  }
  annotations = {
    "cloud.streamnative.io/test" = "true"
  }
}