Function Config Parameters of array and dictionary types

[vamshikrishna83]

In func.yaml config parameters are always stored and read as strings as of now. It becomes complex to device and store custom serliazation format to store either arrays or dictionaries in config parameters.

Both file formats yaml and json have proper support for storing arrays and dictionaries in serialized format. It would be nice, if Fn cli add proper support to store and retreive configuration parameters of types other than strings - like arrays and dictionaries.