[FEATURE] Add a configurable interval parameter

[artur-ios-dev]

It should be possible to pass a Duration parameter which will indicate how often the events are registered (callback is called).

Acceptance criteria:

• Add a final Duration interval to the JoystickView
• _processGesture in the onPanUpdate callback should be called only when the last gesture was processed earlier than frequency's value
• Proper documentation for the new method is written