Changing plot type for LOCA visualizations shown in `warming_levels_approach.ipynb`

[claalmve]

Description of PR

Summary of changes and related issue This PR includes changes for calculation and visualization separation (https://github.com/cal-adapt/climakitae/pull/379) and also makes a cleaner visualization for LOCA2 simulations in wl_approach.ipynb. Below are the before and after images representing LOCA2 simulations using the WarmingLevelVisualize class.

This can be tested with https://github.com/cal-adapt/cae-notebooks/pull/103

Before this PR:

After this PR:

Relevant motivation and context We want to create more interpretable graphics for notebook users.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules