Add GcsIOLoadTestBase and ParquetIO GCS load test - #40226

Add GcsIOLoadTestBase and ParquetIO GCS load test#40226

shunping merged 3 commits into

apache:masterapache/beam:masterfrom

shunping:gcsio-metrics-and-perf-tests-3shunping/beam:gcsio-metrics-and-perf-tests-3Copy head branch name to clipboard