[FEATURE] New method "clearCacheCommand" for all ConfigurationProvider types
[FEATURE] Support NULL arrays when resolving ConfigurationProviders

Allowing NULL instead of an array causes the parameters to be loosened slightly, returning any ConfigurationProviders for the table in question.

It now becomes up to the ConfigurationProvider to assert wether the array actually has usable values.

Currently there is only a single case where a NULL value is passed: when executing the `clearCacheCommand` method on ConfigurationProviders.