[feature] Dependencies between submitted functions

[jan-janssen]

Example:

def add_function(parameter_1, parameter_2):
    return parameter_1 + parameter_2

with Executor(max_cores=1) as exe:
    future_1 = exe.submit(add_function, 1, parameter_2=2)
    future_2 = exe.submit(add_function, 1, parameter_2=future_1)
    print(future_2.result())

[jan-janssen]

This could be just an Executor interface on top of the existing executor. Everything is happening in the same process, so there is no need to submit the dependencies to the queuing system.