[cscore] Fix Java direct callback notifications (#3631)

These relied on the OnStart and OnExit callbacks which were not present
in the wpiutil common CallbackManager code.  Add support for these and
fix up other use cases.

Also fixes notifications to correctly filter on event kind.

This fixes a breakage caused by #3133.

ntcore/src/main/native/cpp/ConnectionNotifier.h

@@ -5,6 +5,8 @@
 #ifndef NTCORE_CONNECTIONNOTIFIER_H_
 #define NTCORE_CONNECTIONNOTIFIER_H_
 
+#include <utility>
+
 #include <wpi/CallbackManager.h>
 
 #include "Handle.h"
@@ -19,7 +21,9 @@ class ConnectionNotifierThread
     : public wpi::CallbackThread<ConnectionNotifierThread,
                                  ConnectionNotification> {
  public:
-  explicit ConnectionNotifierThread(int inst) : m_inst(inst) {}
+  ConnectionNotifierThread(std::function<void()> on_start,
+                           std::function<void()> on_exit, int inst)
+      : CallbackThread(std::move(on_start), std::move(on_exit)), m_inst(inst) {}
 
   bool Matches(const ListenerData& /*listener*/,
                const ConnectionNotification& /*data*/) {