ISPN-4363 Add documentation for Cluster Listeners

* Added documentation about cluster listeners
* Added documentation about filters
* Added documentation about retry
ISPN-4323 ConditionalOperationsConcurrentWriteSkewTest fails randomly

* Changed 500 invocation tests to stress as they can last for minutes
* Moved more simple test to separate file and still functional
ISPN-4651 LevelDB crashes JVM when stop() is called concurrently with write()
ISPN-3979 JdbcStringBasedStore loading of Key2StringMapper class is too
restrictive

* Key2StringMapper class is now loaded using ClassLoader from
* GlobalConfiguration
ISPN-4649 RemoveCommand does not activate the key in Passivation

* No tests added since ISPN-4559 tests cover this scenario
ISPN-4559 Replace fails with cache loader

* Tests all the conditional commands
ISPN-4657 Allow for customization of SearchWorkCreator used by the QueryInterceptor
ISPN-4639 IndexingConfigurationBuilder query module validation is wrong

* Added new validate method that provides access to GlobalConfiguration
* Changed IndexingConfigurationBuilder to use GlobalConfiguration CP
* Added Clustering validations to ensure transport is set
ISPN-4667 Query DSL fails to load entity class in Wildfly
ISPN-3229 L1 cache entries should not be passivated

* Only passivated owned entries
* Added test for L1 entries not being passivated
ISPN-4652 Passivation with shared CacheLoader is not working properly

* ClusteredConditionalCommandTest covers this change
ISPN-4364 Add documentation for Entry Retriever

* Added documentation for retriever
* Also made sure that filter package is public as it should be