Enrich protocol API

[alecandido]

It may be useful to have more flexible operations at hand with the protocols.

In particular, you may want to invoke only part of a routine.
E.g. it may be useful to acquire data with one protocol, and fit with another one (or "manually"), but then use again the original protocol's plot.

The original idea of protocols is to bundle together elements that are closely related, since they will be most often executed together. Nevertheless, allowing more atomic access may enhance composition.

Technical proposal

Instead of returning a dynamically defined function from Executor.__getattribute__

qibocal/src/qibocal/auto/execute.py

Line 204 in 5ff3d90

def wrapper(

the access operation may return an instance of an object, whose __call__ method will reproduce the current behavior of wrapper(), but that will allow accessing the other stages (functions) and attributes (types) through dedicated methods (e.g. .acquisition and .fit), while still registering the execution results in the History as much as possible.