Implement complex full non-square and diagonal complex uncertainty blocks

[timeverettadams]

Resolves #39 and #36

Proposed Changes

• Use left- and right- D-scales of different dimensions in order to allow for the use of generalized plants that have different numbers of exogenous inputs and outputs
• Implement complex diagonal blocks by generating a full block D-scale variable in the structured singular value computation and D-scale fit.
• Add an example of the control of lateral aircraft dynamics that is for a non-square generalized plant and demonstrate how to simulate the closed-loop system of a set of perturbed systems.
• Update the behavior of the structured singular value computation and D-scale fit to ensure that block_structure = None implies that it is a complex full block (i.e., D-scales should be identity).

Checklist

• Write unit tests
• Write examples in docstrings (only updated previous examples to work with new D-scale structure)
• Update Sphinx documentation
• Bump version number and date in pyproject.toml, doc/conf.py,
  README.rst, and CITATION.cff.

[sdahdah]

This is awesome, thanks @timeverettadams