Patch/update visualizations

[iosefa]

Visualization:

• Added an optional fig_title parameter to plot_2d for custom plot titles.
• Refactored plotting functions (including plot_pad) for easier slicing and customization.

Calculations:

• Updated calculate_pad and calculate_pai so columns with zero returns become NaN, avoiding misleading zero values.

Outlier Removal:

• Extended remove_outliers_and_clean with a new remove parameter to optionally discard outliers entirely.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pyforestscan/filters.py	11.11%	8 Missing ⚠️

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Files with missing lines	Coverage Δ
pyforestscan/calculate.py	100.00% <100.00%> (ø)
tests/test_calculate.py	100.00% <100.00%> (ø)
pyforestscan/filters.py	34.14% <11.11%> (-7.04%)	⬇️

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