[ASTERIXDB-2108][API][RT] Add Processed Objects Metric

- user model changes: no
- storage format changes: no
- interface changes: yes
  Introduced IOperatorStats and IStatsCollector APIs to collect
  runtime stats.

Details:
- Introduce OperatorStats API to report operators runtime stats.
- Introduce StatsCollector API to report task runtime stats.
- Implement OperatorStats for IndexSearchOperatorNodePushable
  (tuple counter only).
- Add "processedObjects" metric to QueryService API.
- Add Stats to ExecuteStatementResponseMessage to pass stats
  from CC to NCQueryService.
- Add metrics test cases.

Change-Id: Ie4afe6a676ef0b8a31d36d7dafc13a4023ebf177
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2032
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-am-common/pom.xml b/hyracks-fullstack/hyracks/hyracks-storage-am-common/pom.xml
index 526caa9..2b3f3cb 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-am-common/pom.xml
+++ b/hyracks-fullstack/hyracks/hyracks-storage-am-common/pom.xml
@@ -81,6 +81,11 @@
       <version>${project.version}</version>
     </dependency>
     <dependency>
+      <groupId>org.apache.hyracks</groupId>
+      <artifactId>hyracks-control-common</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <scope>test</scope>