Update PRBS Function and Remove generate_prbs Utility

[armando-palacio]

This Pull Request (PR) introduces several changes to the PRBS (Pseudo-Random Binary Sequence) function within the project. Here's a summary of the updates:

1. del: delete generate_prbs function from utils.py module

   • Remove the generate_prbs function from the utils.py module.

2. breaking: PRBS function no longer accepts n and user arguments.

   • Remove the user argument from the PRBS function, suggesting it can be passed directly to DAC() or binary_sequence.
   • Rename the n parameter to len and limit the output length of the LFSR.
   • Use np.ndarray instead of ndarray.

3. feat: Add error handling for len parameter in PRBS function

   • Introduce error handling for the len parameter in the PRBS function.
   • Raise a new exception if len is not an integer.
   • Fix len to 2**order-1 if it exceeds this value.
   • Add exception raises to docstring.

4. tests: Add test for PRBS function in module devices_test.py

   • Add test cases for the PRBS function in the devices_test.py module.