🗺️🏘️ Feature/plot potential site

[mvillasante]

Description

This pull request adds functionality to plot potential sites using GPS and configuration data, extending the CLI and supporting classes accordingly. Key changes include:

• R/cli.R: Introduced the plot_potential_site function that reads configuration and GPS data, performs representative assessment using the Track2KBA_Wrapper, computes a potential site, and saves the generated plot as a PNG.
• R/representative_assess.R: Added the get_potential_site method to the Track2KBA_Wrapper R6 class to support computation of potential sites using population size and representative assessment.
• tests/testthat/test_cli.R: Added unit tests for the new plotting functionality, including checks for correct figure output and cleanup.
  These changes enable automated assessment and plotting of potential conservation sites directly from the CLI, improving extensibility and testing of site-specific analyses.

[codecov]

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