[HUDI-896] Report test coverage by modules & parallelize CI (#1753)

- use codecov flags for each module to report coverage
- parallelize CI jobs for shorter time
- add a testcase for MetricsReporterFactory (to trigger codecov comment)

scripts/report_coverage.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+
+modules=(
+  hudi-cli
+  hudi-client
+  hudi-common
+  hudi-examples
+  hudi-hadoop-mr
+  hudi-hive-sync
+  hudi-integ-test
+  hudi-spark
+  hudi-timeline-service
+  hudi-utilities
+)
+for module in "${modules[@]}"; do
+  bash <(curl -s https://codecov.io/bash) -s "$module" -F "${module//-/}"
+done