Add missing hasPackage function

[mkiki]

After logging in a Campaign instance, the "logon" call returns a list of active packages on the instance.
Make this list available to the clients and add hasPackage function with 2 syntaxes:

• hasPackage(packageId)
• hasPackage(namespace, name)

[catholicon]

Is this different from hasPackage?

[mkiki]

I had initially added hasPackage to the Client object has described in this request.
In version 1.0; I added support for the application object which happens to also have a hasPackage function (https://docs.adobe.com/content/help/en/campaign-classic/technicalresources/api/m-Application-hasPackage.html)
Both should return the same thing