Removed redundant comments and streamlined examples for clarity across plotting methods. Improved diagonal line logic, refactored legend handling, and enhanced parameter handling for plotting/styling functions to improve maintainability and consistency.``

Signed-off-by: Andrew Mitchell <a.j.mitchell@ucl.ac.uk>

Introduce a new plotting module with a cleaner architecture based on composition. Includes the main `ISOPlot` class, various visualization layers, and supporting constants, enabling flexible and modular circumplex plotting functionality.

Signed-off-by: Andrew Mitchell <a.j.mitchell@ucl.ac.uk>

New refactoring is in the plotting/new submodule

Signed-off-by: Andrew Mitchell <a.j.mitchell@ucl.ac.uk>

Consolidated layer management into `add_layer` with improved versatility, replacing multiple layer-specific methods with a unified interface. Deprecated legacy methods for backward compatibility and refined styling and subplot creation workflows for better clarity and maintainability. Updated dependencies to include `deprecated` library.

Signed-off-by: Andrew Mitchell <a.j.mitchell@ucl.ac.uk>

Enhanced plotting functionality by introducing `subplot_by` for grouping data in subplots, along with options like `auto_allocate_axes`, `adjust_figsize`, and `subplot_titles`. Refactored layer rendering and documentation to incorporate these features, improving customization and usability. Updated dependencies to include `types-deprecated`.

Signed-off-by: Andrew Mitchell <a.j.mitchell@ucl.ac.uk>

- Replaces type casting with direct parameter access using new get() method
- Introduces ParamModels dataclass for better parameter organization
- Simplifies style management with dedicated methods for grid, labels and legends
- Reduces SPI layer sample size default from 10000 to 1000
- Improves code maintainability and readability through better encapsulation