Adds ArtifactRegistry v1 REST API

[jparris]

• API comes from https://artifactregistry.googleapis.com/$discovery/rest?version=v1
• api-spec-converter -f google -t openapi_3 artifactregistry -s yaml > openapi.yaml
• I did bump openapi version to openapi: 3.1.0 to overcome the issue below.

./generate-all.sh
Generating for artifactregistry-v1
Found spec: ./google/artifactregistry-v1/openapi.yaml
Exception in thread "main" org.openapitools.codegen.SpecValidationException: There were issues with the specification. The option can be disabled via validateSpec (Maven/Gradle) or --skip-validate-spec (CLI).
 | Error count: 1, Warning count: 29
Errors:
	-attribute components.schemas.ProjectSettings.enumDeprecated is unexpected
Warnings:
	-attribute components.schemas.ProjectSettings.enumDeprecated is unexpected

[abdolence]

Thanks for contributions and sharing workarounds for the spec 👍🏻

Before we merge this I wanted to clarify if there were some limitations for gRPC version so you went for REST API?
https://cloud.google.com/artifact-registry/docs/reference/rpc/google.devtools.artifactregistry.v1