RDS: Add support for create DBInstanceReadReplica (#92)

Fixes aws-controllers-k8s/community#893

**Description of changes:**
It's from a old pr. #84 

This pr is adding ability to allow create DBInstanceReadReplica, api call: https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBInstanceReadReplica.html

Some small bug fix:
1. copy over newCreateDBInstanceReadReplicaInput instead asking template generate it, so we can set `PerformanceInsightsEnabled` directly instead of using `EnablePerformanceInsights`
2. add extra nil check here https://github.com/aws-controllers-k8s/rds-controller/blob/d72e06ba7e1fc24eed5f02a36b367fc4c4bf9354/pkg/resource/db_instance/hooks.go#L207 
3. update status to spec for cluster's allocated storage . https://github.com/aws-controllers-k8s/rds-controller/blob/d72e06ba7e1fc24eed5f02a36b367fc4c4bf9354/pkg/resource/db_cluster/custom_update.go#L108  

**Testing part:** 
Tested with successful creation of 
- same region + encrypted source instance
- same region + unencrypted source instance
- cross region + encrypted source instance
- cross region + unencrypted source instance

**Notes:** 
I don't have e2e test for this case yet which is because I'm blocked on this issue. aws-controllers-k8s/community#1325 
Will add e2e tests after 1325 issue is resolved. 

Also this pr has a dependency pr: aws-controllers-k8s/code-generator#339 

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: brucegucode

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2022-06-20T19:21:08Z"
+  build_date: "2022-06-21T21:15:15Z"
   build_hash: a45f3b900849ec03c5e16ed2778c0b8e2923ffee
   go_version: go1.18.2
   version: v0.19.1
-api_directory_checksum: 7567208aa7463aaa3c937e45107f520e6fc2946f
+api_directory_checksum: 891cddd4b051d5b865abddeb1a19760b9fbdcd37
 api_version: v1alpha1
 aws_sdk_go_version: v1.44.27
 generator_config_info:
-  file_checksum: c9c7e5d1decf6b529a8b451570ccc4fdfe1e6f79
+  file_checksum: 25009e8400a5efd62efed790fd4b5015466a2dc9
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/db_cluster.go

@@ -175,6 +175,7 @@ resources:
           resource: Key
           service_name: kms
           path: Status.ACKResourceMetadata.ARN
+      # Used by restore db instance from db snapshot
       DBSnapshotIdentifier:
         from:
           operation: RestoreDBInstanceFromDBSnapshot
@@ -183,6 +184,27 @@ resources:
         from:
           operation: RestoreDBInstanceFromDBSnapshot
           path: UseDefaultProcessorFeatures
+      # Used by create db instance read replica
+      SourceDBInstanceIdentifier:
+        from:
+          operation: CreateDBInstanceReadReplica
+          path: SourceDBInstanceIdentifier
+      DestinationRegion:
+        from:
+          operation: CreateDBInstanceReadReplica
+          path: DestinationRegion
+      ReplicaMode:
+        from:
+          operation: CreateDBInstanceReadReplica
+          path: ReplicaMode
+      SourceRegion:
+        from:
+          operation: CreateDBInstanceReadReplica
+          path: SourceRegion
+      PreSignedURL:
+        from:
+          operation: CreateDBInstanceReadReplica
+          path: PreSignedUrl
     renames:
       operations:
         CreateDBInstance: