feat(metastore): start generating apiv1alpha (#3747)

Author: codyoss

internal/.repo-metadata-full.json

@@ -567,6 +567,14 @@
     "docs_url": "https://pkg.go.dev/cloud.google.com/go/memcache/apiv1beta2",
     "release_level": "beta"
   },
+  "cloud.google.com/go/metastore/apiv1alpha": {
+    "distribution_name": "cloud.google.com/go/metastore/apiv1alpha",
+    "description": "Dataproc Metastore API",
+    "language": "Go",
+    "client_library_type": "generated",
+    "docs_url": "https://pkg.go.dev/cloud.google.com/go/metastore/apiv1alpha",
+    "release_level": "alpha"
+  },
   "cloud.google.com/go/monitoring/apiv3/v2": {
     "distribution_name": "cloud.google.com/go/monitoring/apiv3/v2",
     "description": "Cloud Monitoring API",

internal/gapicgen/generator/config.go

@@ -1017,6 +1017,14 @@ var microgenGapicConfigs = []*microgenConfig{
 		// GA after 2021/03/23
 		releaseLevel: "beta",
 	},
+	{
+		inputDirectoryPath:    "google/cloud/metastore/v1alpha",
+		pkg:                   "metastore",
+		importPath:            "cloud.google.com/go/metastore/apiv1alpha",
+		gRPCServiceConfigPath: "google/cloud/metastore/v1alpha/metastore_grpc_service_config.json",
+		apiServiceConfigPath:  "google/cloud/metastore/v1alpha/metastore_v1alpha.yaml",
+		releaseLevel:          "alpha",
+	},
 
 	// Non-Cloud APIs
 	{