feat(route53): multivalue answer routing (aws#28938)

### Issue

Closes aws#28939.

### Reason for this change

When configuring multi-value answer routing, it was always necessary to set it via the L1 method or use an escape hatch.

### Description of changes

I added `multiValueAnswering` property to `RecordSetProps`.

```ts
    new route53.ARecord(this, 'MultiValueAnswerRouting', {
      zone: hostedZone,
      recordName: 'www',
      target: route53.RecordTarget.fromIpAddresses('1.2.3.4'),
      multiValueAnswer: true, // added
    });
```

### Description of how you validated changes

I added unit test and integ test.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

packages/@aws-cdk-testing/framework-integ/test/aws-route53/test/integ.multi-value-answer-routing.js.snapshot/multi-value-answer-routing.template.json

@@ -0,0 +1,60 @@
+{
+ "Resources": {
+  "HostedZoneDB99F866": {
+   "Type": "AWS::Route53::HostedZone",
+   "Properties": {
+    "Name": "cdk.dev."
+   }
+  },
+  "MultiValueAnswerRoutingF3C1E535": {
+   "Type": "AWS::Route53::RecordSet",
+   "Properties": {
+    "HostedZoneId": {
+     "Ref": "HostedZoneDB99F866"
+    },
+    "MultiValueAnswer": true,
+    "Name": "www.cdk.dev.",
+    "ResourceRecords": [
+     "1.2.3.4"
+    ],
+    "SetIdentifier": "MVA_ID_multivalueanswerroutingMultiValueAnswerRoutingD94947BD",
+    "TTL": "1800",
+    "Type": "A"
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}