Combine stochastic testing with go fuzzing

[b-scholz]

The stochastic selection of the following state and its parameters can be swapped with the go fuzzing framework from go version 1.18 onwards. The idea is that the fuzzing framework is used as a driver for the stochastic framework to increase coverage.

The fuzzing string needs to be interpreted as a series of op-args. Operations for scoping begin-end block/tx/epoche need to be fixed (i.e. we want to enforce correct scoping).