Refactor `plot.py` into smaller, focused modules for better maintainability and organization

[diegoabt]

Currently, the plot.py file in the visualization submodule contains a variety of plotting functions, each serving distinct purposes such as graph plotting, adjacency matrix visualization, and performance metrics evaluation. While the functions are well-written, the length and diversity of functionalities in this single file make it harder to navigate, maintain, and extend.

[mcontisc]

As part of this issue, we could also include in the visualization submodule the following functions:

• plot_matrices and plot_temporal_arrays from the tutorial "Decoding Temporal Relationships with DynCRep"
• plot_matrices and plot_matrix from the tutorial "Analysis Of A Real-World Dataset Using The JointCRep Algorithm"