Revert google_dns_record_set to previous implementation

[c2thorn]

Fixes hashicorp/terraform-provider-google#9257
Fixes hashicorp/terraform-provider-google#9112
Fixes hashicorp/terraform-provider-google#9416

This PR reverts the resource to the original handwritten version that uses the DNS client library from the MM-generated version that used the new API.

Deviations from the old handwritten version include:

• More tests
• ttl was made optional in the previous iteration, I am keeping it optional for backwards-compatibility
• reset the resource ID after updating. The type field can be updated which is a part of the ID. This allows one of the newer tests to import correctly

Release Note Template for Downstream PRs (will be copied)

dns: fixed an issue in `google_dns_record_set` where creating the resource would result in an 409 error

dns: fixed an issue in `google_dns_record_set` where `rrdatas` could not be updated

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 427 insertions(+), 540 deletions(-))
Terraform Beta: Diff ( 5 files changed, 427 insertions(+), 540 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComputeManagedSslCertificate_managedSslCertificateBasicExample|TestAccDNSRecordSet_rrdatasUpdate|TestAccDNSRecordSet_basic|TestAccDNSRecordSet_Update|TestAccDNSRecordSet_changeType|TestAccDNSRecordSet_nestedNS|TestAccDNSRecordSet_quotedTXT|TestAccDNSRecordSet_uppercaseMX You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=205564

[modular-magician]

Tests failed during RECORDING mode: TestAccDNSRecordSet_changeType Please fix these to complete your PR

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 428 insertions(+), 539 deletions(-))
Terraform Beta: Diff ( 6 files changed, 429 insertions(+), 541 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDNSRecordSet_changeType You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=205585

[rileykarson]

Can we add a test that replicates hashicorp/terraform-provider-google#9257?

[rileykarson]

Thinking out loud: The id change is safe because we don't use it in Read and neither did the old implementation (so users are safely able to downgrade if needed)

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 374 insertions(+), 432 deletions(-))
Terraform Beta: Diff ( 6 files changed, 375 insertions(+), 433 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDNSRecordSet_secondaryNS You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=206126