Two key plot

[vrabiczan]

No description provided.

[firefly-cpp]

@vrabiczan, Thanks for your pull request. Before we merge, please give more details about what you are proposing and whether you have already validated results with the other state-of-the-art software packages in the current context with arulesViz.

Additionally, please add also a test scenario.

[vrabiczan]

Introduces a new function, two_key_plot(), to visualize association rules using a Two-key plot. The function supports both static (Matplotlib) and interactive (Plotly) visualizations, allowing users to explore rules based on two selected metrics (e.g., support and confidence).

Key Features:

• Supports customizable metric selection for X and Y axes.
• Uses rule order as a color dimension.
• Provides an interactive visualization using Plotly for better data exploration.
• Implements a static Matplotlib version for traditional plotting.

I have compared the visualization results of my implementation with those from arulesViz and validated that the outputs are consistent across both approaches.
Interactive Two-key plot visualization using NiaARM:

Interactive Two-key plot visualization using arulesViz:

[firefly-cpp]

LGTM