feat(route53): weighted routing (#28705)

In this PR, I have implemented support for weighted routing. 
By passing the `weight` and `setIdentifier` parameters when registering a record, it is possible to perform weighted routing among records that share the same name and type.

```ts
new route53.ARecord(this, `WeightedRecord${index}`, {
        zone: hostedZone,
        recordName: 'www',
        weight: 20, // added
        setIdentifier: 'uniqueId', // added
        target: route53.RecordTarget.fromIpAddresses('1.2.3.4'),
      });
```

Closes #26753.

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