feat(logging): Add Cloud Logging Saved Query resource

[kvanzuijlen]

This PR adds a resource for Cloud Logging Saved Queries, which can be used for both Logging Saved Queries and Log Analytics Saved Queries.

Fixes hashicorp/terraform-provider-google#18023

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

`google_logging_saved_query`

[github-actions]

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[ramonvermeulen]

LGTM, nice work!

Ran tests locally:

sh -c "'/Users/ramon/go/src/github.com/hashicorp/terraform-provider-google/scripts/gofmtcheck.sh'"
==> Checking that code complies with gofmt requirements...
go vet
TF_ACC_REFRESH_AFTER_APPLY=1 TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google/services/logging -v -run=TestAccLoggingSavedQuery_ -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"                    
=== RUN   TestAccLoggingSavedQuery_loggingSavedQueryBasicExample
=== PAUSE TestAccLoggingSavedQuery_loggingSavedQueryBasicExample
=== RUN   TestAccLoggingSavedQuery_loggingSavedQueryPrivateExample
=== PAUSE TestAccLoggingSavedQuery_loggingSavedQueryPrivateExample
=== RUN   TestAccLoggingSavedQuery_loggingSavedQuerySummaryFieldsExample
=== PAUSE TestAccLoggingSavedQuery_loggingSavedQuerySummaryFieldsExample
=== RUN   TestAccLoggingSavedQuery_loggingSavedQuerySqlBasicExample
=== PAUSE TestAccLoggingSavedQuery_loggingSavedQuerySqlBasicExample
=== RUN   TestAccLoggingSavedQuery_update
=== PAUSE TestAccLoggingSavedQuery_update
=== CONT  TestAccLoggingSavedQuery_loggingSavedQueryBasicExample
=== CONT  TestAccLoggingSavedQuery_loggingSavedQuerySqlBasicExample
=== CONT  TestAccLoggingSavedQuery_loggingSavedQuerySummaryFieldsExample
=== CONT  TestAccLoggingSavedQuery_update
=== CONT  TestAccLoggingSavedQuery_loggingSavedQueryPrivateExample
--- PASS: TestAccLoggingSavedQuery_loggingSavedQuerySummaryFieldsExample (7.36s)
--- PASS: TestAccLoggingSavedQuery_loggingSavedQueryBasicExample (7.87s)
--- PASS: TestAccLoggingSavedQuery_loggingSavedQueryPrivateExample (8.01s)
--- PASS: TestAccLoggingSavedQuery_loggingSavedQuerySqlBasicExample (8.17s)
--- PASS: TestAccLoggingSavedQuery_update (12.32s)
PASS
ok      github.com/hashicorp/terraform-provider-google/google/services/logging  13.990s