Improvements to Bad Pixel Detection and Cleaning

[AarynnCarter]

This PR make some changes to the bad pixel detection and cleaning routines, specific updates include:

• Splitting of pixel finding and fixing routines into separate function calls.
• The addition of an early version of a new finding routine using an image gradient based method. Still requires further development.
• The addition of a new fixing routine based on a 2D interpolation of nearby pixels.

This change will break backwards compatibility with previous versions of spaceKLIP, as the fix_bad_pixels() function has been fundamentally changed. While this isn't ideal, the new structure should allow for more flexibility moving forward, where further breaks to backwards compatibility are unlikely.

[AarynnCarter]

TODO:

• [x] Convert function to clean_bad_pixels()
• [x] Add old fix_bad_pixels() function back in to preserve backwards compatibility.
• [x] Make sure any deprecated sub-functions are also accounted for.