Add hook helper methods

[DonnC]

Will be nice to have helper methods when using JAWCE as a dependency to aid in the reflective hooks

Consider the 2 approaches

1. Repetitive approach (assume you have many of these hooks)

// reflective hook
public class GreetingHook {
   private final HookArgs args;
    private final ISessionManager session;
    private final String sessionId;

    protected GreetingHook(HookArgs args) {
        this.args = args;
        this.sessionId = args.getChannelUser().waId();
        this.session = SessionLocator.getSessionManager().session(this.sessionId);
    }

   // ... hook methods ...
}

2. Using a helper abstract class

// reflective hook
public class GreetingHook extends AbstractHook {
    public GreetingHook(HookArgs args) {
        super(args, SessionLocator.getSessionManager());
    }

   // ... hook methods ...
}

[DonnC]

Changed architecture, the library now supports spring beans for easy DI