creates invoke metadata given result parameter name, a list of dependencies (which are Assets),
and a string representation of input params

returns the keccak512 digest

this takes a map of input arguments, and a function to execute which returns a map with 2 keys: a
list of Asset dependencies and results, which is a map of result params names and the value is content.

It executes the function to compute the results, creates provenance metadata , registers the asset(s)
and uploads the contents