KMS: add plural data source for resource_google_kms_key_ring

[modular-magician]

This PR adds a new plural data source google_kms_key_rings.

Note:

• It's necessary to explicitly add the id field to the schema for each individual key ring. Similar behavior also appears here: Add plural data source google_kms_crypto_keys GoogleCloudPlatform/magic-modules#11053
• One attribute is missing which is the createTime. Only reason why this wasn't ended in this PR is due the attribute not being included in resource_google_kms_key_ring.go

Running locally:

└─(16:10:49 on main ✹ ✭)──> envchain GCLOUD make testacc TEST=./google/services/kms TESTARGS='-run TestAccDataSourceGoogleKmsKeyRings_basic'                                                     2 ↵ ──(Wed,Jun26)─┘
TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google/services/kms -v -run TestAccDataSourceGoogleKmsKeyRings_basic -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccDataSourceGoogleKmsKeyRings_basic
2024/06/26 16:11:06 [INFO] Authenticating using configured Google JSON 'credentials'...
2024/06/26 16:11:06 [INFO]   -- Scopes: [https://www.googleapis.com/auth/cloud-platform https://www.googleapis.com/auth/userinfo.email]
2024/06/26 16:11:06 [INFO] Authenticating using configured Google JSON 'credentials'...
2024/06/26 16:11:06 [INFO]   -- Scopes: [https://www.googleapis.com/auth/cloud-platform https://www.googleapis.com/auth/userinfo.email]
2024/06/26 16:11:06 [DEBUG] Waiting for state to become: [success]
2024/06/26 16:11:06 [INFO] Terraform is using this identity: mauricio-alvarezleon@hc-terraform-testing.iam.gserviceaccount.com
2024/06/26 16:11:06 [INFO] Instantiating Google Cloud KMS client for path https://cloudkms.googleapis.com/
2024/06/26 16:11:06 [DEBUG] Retry Transport: starting RoundTrip retry loop
2024/06/26 16:11:06 [DEBUG] Retry Transport: request attempt 0
2024/06/26 16:11:07 [DEBUG] Retry Transport: Stopping retries, last request was successful
2024/06/26 16:11:07 [DEBUG] Retry Transport: Returning after 1 attempts
2024/06/26 16:11:07 [DEBUG] Retry Transport: starting RoundTrip retry loop
2024/06/26 16:11:07 [DEBUG] Retry Transport: request attempt 0
2024/06/26 16:11:07 [DEBUG] Retry Transport: Stopping retries, last request was successful
2024/06/26 16:11:07 [DEBUG] Retry Transport: Returning after 1 attempts
--- PASS: TestAccDataSourceGoogleKmsKeyRings_basic (25.72s)
PASS
ok      github.com/hashicorp/terraform-provider-google/google/services/kms      26.964s

Release Note Template for Downstream PRs (will be copied)

`google_kms_key_rings`

Derived from GoogleCloudPlatform/magic-modules#11061

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