Allow filtering by event type (#1367)

* Allow filtering by event type

* Update EventsCmdImpl.java

* Update EventsCmd.java

* Update EventsCmd.java

* Update EventsCmdImpl.java

* Update FiltersBuilder.java

* default

* Implements withEventTypeFilter with string

https://github.com/docker-java/docker-java/pull/1367#pullrequestreview-417304293

* fixed imports

* Update docker-java-api/src/main/java/com/github/dockerjava/api/command/EventsCmd.java

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

* Update docker-java-api/src/main/java/com/github/dockerjava/api/command/EventsCmd.java

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

* Update docker-java-core/src/main/java/com/github/dockerjava/core/util/FiltersBuilder.java

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

* Update docker-java-core/src/main/java/com/github/dockerjava/core/util/FiltersBuilder.java

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

* Added IT

* Added IT

* Update EventsCmdIT.java

Co-authored-by: Archimedes Trajano <archimedes.trajano@devhaus.com>
Co-authored-by: Sergei Egorov <bsideup@gmail.com>