Silly useless objects

https://github.com/adobe/aio-cli-plugin-app/blob/7a32a8fa62937fac7120f3cee91e636b8a7499eb/src/lib/log-forwarding.js#L180

isDefined, isDefault, isEqual are all pretty strange overuse/misuse of object oriented principles.
There are cases where the object is null, so calls to null.isDefined will throw, where an isDefined function or a simple test of `config?.destination` would be sufficient.