feat(rds): add rds_cluster_protected_by_backup_plan check

prowler/providers/aws/services/rds/rds_cluster_protected_by_backup_plan/rds_cluster_protected_by_backup_plan.metadata.json

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+{
+  "Provider": "aws",
+  "CheckID": "rds_cluster_protected_by_backup_plan",
+  "CheckTitle": "Check if RDS clusters are protected by a backup plan.",
+  "CheckType": [
+    "Software and Configuration Checks, AWS Security Best Practices"
+  ],
+  "ServiceName": "rds",
+  "SubServiceName": "",
+  "ResourceIdTemplate": "arn:aws:rds:region:account-id:db-cluster",
+  "Severity": "medium",
+  "ResourceType": "AwsRdsDbInstance",
+  "Description": "Check if RDS clusters are protected by a backup plan.",
+  "Risk": "Without a backup plan, RDS clusters are vulnerable to data loss, accidental deletion, or corruption. This could lead to significant operational disruptions or loss of critical data.",
+  "RelatedUrl": "https://docs.aws.amazon.com/aws-backup/latest/devguide/assigning-resources.html",
+  "Remediation": {
+    "Code": {
+      "CLI": "aws backup create-backup-plan --backup-plan , aws backup tag-resource --resource-arn <rds-cluster-arn> --tags Key=backup,Value=true",
+      "NativeIaC": "",
+      "Other": "https://docs.aws.amazon.com/securityhub/latest/userguide/rds-controls.html#rds-26",
+      "Terraform": ""
+    },
+    "Recommendation": {
+      "Text": "Create a backup plan for the RDS cluster to protect it from data loss, accidental deletion, or corruption.",
+      "Url": "https://docs.aws.amazon.com/aws-backup/latest/devguide/assigning-resources.html"
+    }
+  },
+  "Categories": [],
+  "DependsOn": [],
+  "RelatedTo": [],
+  "Notes": ""
+}

prowler/providers/aws/services/rds/rds_cluster_protected_by_backup_plan/rds_cluster_protected_by_backup_plan.py

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+from prowler.lib.check.models import Check, Check_Report_AWS
+from prowler.providers.aws.services.backup.backup_client import backup_client
+from prowler.providers.aws.services.rds.rds_client import rds_client
+
+
+class rds_cluster_protected_by_backup_plan(Check):
+    def execute(self):
+        findings = []
+        for db_cluster_arn, db_cluster in rds_client.db_clusters.items():
+            report = Check_Report_AWS(self.metadata())
+            report.region = db_cluster.region
+            report.resource_id = db_cluster.id
+            report.resource_arn = db_cluster_arn
+            report.resource_tags = db_cluster.tags
+            report.status = "FAIL"
+            report.status_extended = (
+                f"RDS Cluster {db_cluster.id} is not protected by a backup plan."
+            )
+
+            if (
+                db_cluster_arn in backup_client.protected_resources
+                or f"arn:{rds_client.audited_partition}:rds:*:*:cluster:*"
+                in backup_client.protected_resources
+                or "*" in backup_client.protected_resources
+            ):
+                report.status = "PASS"
+                report.status_extended = (
+                    f"RDS Cluster {db_cluster.id} is protected by a backup plan."
+                )
+
+            findings.append(report)
+
+        return findings