Add benchmark implementations for Hazelcast Jet

Succeeds !150 (closed) and closes #234 (closed).

Open points are:

• Fix open PMD warnings
• Build and push container images in CI pipeline (see !187 (merged)) (for @she)
• Add (updated) Benchmark definitions
• Necessary adjustment for monitoring the lag
• Testing
• Issue reported in 16de8bb5 (comment 10376)
  • The link generated by GitLab seems not to work. The corresponding file/line is 16de8bb5 with comment by @stu208458:

    Throws an exception when trying to run a jUnit test. Cause unknown. Might be caused by:

    • Wrong configuration of test pipeline/test inputs/etc.
    • Multiple test inputs not supportet

    Exception: 10:06:21.127 [[33m WARN[0m] [[34mc.h.s.i.o.i.Invocation[0m] Future.complete(Object) on completed future. Request: Invocation{op=com.hazelcast.map.impl.query.QueryOperation{serviceName='hz:impl:mapService', identityHash=313163083, partitionId=-1, replicaIndex=0, callId=-2, invocationTime=1633334781030 (2021-10-04 10:06:21.030), waitTimeout=-1, callTimeout=60000, tenantControl=com.hazelcast.spi.impl.tenantcontrol.NoopTenantControl@0, name=__jet.records}, tryCount=250, tryPauseMillis=500, invokeCount=1, callTimeoutMillis=60000, firstInvocationTimeMs=1633334781030, firstInvocationTime='2021-10-04 10:06:21.030', lastHeartbeatMillis=0, lastHeartbeatTime='1970-01-01 01:00:00.000', target=[127.0.0.1]:5701, pendingResponse={VOID}, backupsAcksExpected=-1, backupsAcksReceived=0, connection=null}, current value: ExceptionalResult{cause=com.hazelcast.core.HazelcastInstanceNotActiveException: Hazelcast instance is not active!}, offered value: com.hazelcast.map.impl.query.QueryResult@56c31ac5 [31mjava.lang.Exception

• Include changes from !238 (merged)
• Refactor package structure according to #310 (closed)