Determines whether the specified Subscription is accepted by
this SubscriptionFilter i.e. whether the caller of this
instance is to include or exclude the specified Subscription
from their list of processed Subscriptions.
Parameters:
subscription - the Subscription to be checked
Returns:
true if this SubscriptionFilter accepts
the specified subscription i.e. the caller of this instance
should include subscription in their list of processed
Subscriptions; otherwise, false