[Route53] cdk-route53 Cross account records.

Extend Cross Acount Records to be more than Just Zone Delegations. It would be great if out of the box, we could do any kind of record in a zone that was not in the account that the stack is in.

### Use Case

many times, we want to be able to add records for external things... eg

customerportal.domain.com
www.domain.com

### Proposed Solution

### Other

* [ ] :wave: I may be able to implement this feature request
* [ ] :warning: This feature might incur a breaking change

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This is a :rocket: Feature Request

Start by reading the cdk-route53 implementation of cross-account zone delegations and the surrounding AWS Route53 APIs. Define which record types and cross-account permissions must be supported for records such as customerportal.domain.com and www.domain.com, then document tests that demonstrate records can be created in a zone owned by another account.

Written by the indexing model from the issue text.