interface Deno.CaaRecord
If Deno.resolveDns is called with "CAA" record type
specified, it will resolve with an array of objects with this interface.
critical: boolean
If true, indicates that the corresponding property tag must be
understood if the semantics of the CAA record are to be correctly
interpreted by an issuer.
Issuers must not issue certificates for a domain if the relevant CAA
Resource Record set contains unknown property tags that have critical
set.
tag: string
An string that represents the identifier of the property represented by the record.
value: string
The value associated with the tag.