[Feature] Implementation of noise protocol.

[RolandMacDoland]

Closes #48, rework of #23.

@gvelikova This is ready for you to take over. As discussed, there are the following points:

• Move ./errors/errors.py -> ./exceptions/exceptions.py
• Change protocol occurrences to measurement from/in qadence.measurements to remove ambiguity including DifferentiableBackend
• Harmonise across all backends
• Test the sample corruption from backends and quantum model
• Close [Feat] Added simulated readout error routines #23 whenever you feel so
• Test with other protocols that require sample ie. Measurements
• Add on sampling with readout error in the documentation.

Hope that makes sense.

[gvelikova]

Docstrings and proper tests remaining too :).

[madagra]

A few minor comments, but overall looks good to me @gvelikova and @Roland-djee.

[RolandMacDoland]

Thanks @gvelikova. If it passes, you can hit the merge button :)