Add bigquery-readapi-team to subfolder code owner

Author: benhxy

CODEOWNERS

@@ -43,6 +43,7 @@ document-warehouse @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPla
 # Self-service
 ai-platform @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/text-embedding @GoogleCloudPlatform/cloud-samples-reviewers
 asset @GoogleCloudPlatform/cloud-asset-analysis-team @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
+bigquery @GoogleCloudPlatform/bigquery-readapi-team @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
 dlp @GoogleCloudPlatform/googleapis-dlp @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
 model-armor @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers @GoogleCloudPlatform/cloud-modelarmor-team
 security-center @GoogleCloudPlatform/gcp-security-command-center @GoogleCloudPlatform/nodejs-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers