feat: Add support to health check

[aming27]

Add health_checked_targets support into wrr block.(https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/dns_record_set.html#health_checked_targets-1)

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[Devansh-Bhatt]

@aming27 I think we should keep the the value of records variable present in the routing policy dynamic block to be optional as well. This way it would let me keep only health-checked targets without any normal rrdatas. Currently It does not let me do that. Otherwise, this patch works perfectly

[aming27]

@Devansh-Bhatt I've added rrdatas = try(wrr.value.records, []) for making rrdatas optional.

[aming27]

Hi @Devansh-Bhatt please any update ? Thanks!!!

[JorTurFer]

Hi! Any update?