Memory error rate is not read properly

[Naphann]

The error parameter of a stationary qubit is confusing with the "rate" vs "ratio". Currently the StationaryQubit.memory_error_rate is unused and misleads users to think that setting it to 0 means we have perfect memory.

https://github.com/sfc-aqua/quisp/blob/db34b8f704746c6180e538c79d2844fd1c4ad91d/quisp/modules/QNIC/StationaryQubit/StationaryQubit.ned#L60-L77

Currently, the ratio keyword for memory error is unused and we are supposed to treat the rate and ratio correctly.

In order to properly and correctly build the transition matrix as done in the initialization process of StationaryQubit (below)

https://github.com/sfc-aqua/quisp/blob/db34b8f704746c6180e538c79d2844fd1c4ad91d/quisp/modules/QNIC/StationaryQubit/StationaryQubit.cc#L42-L60

We should remove unused parameters which can cause conflict or misunderstanding to users.

Examples of things that should be removed (suggested):

• memory_error_rate (as this would cause weird behaviours when all the rate does not sum to 1)
• all the ratios and only use rate for memory error