feat: add x and y medians to plot

[brunorosilva]

Fixes #181

Describe your changes

Compute the median values for x and for y using the pd.Series.median method. Added median to the get_values docstring.

Checklist

• [x] Test cases have been modified/added to cover any code changes.
• [x] Docstrings have been modified/created for any code changes.
• [x] All linting and formatting checks pass (see the contributing guidelines for more information).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.82%. Comparing base (18ae0bb) to head (81f69e9). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
+ Coverage   98.80%   98.82%   +0.01%     
==========================================
  Files          84       84              
  Lines        2099     2128      +29     
  Branches      123      128       +5     
==========================================
+ Hits         2074     2103      +29     
  Misses         24       24              
  Partials        1        1              

Files with missing lines	Coverage Δ
src/data_morph/__init__.py	100.00% <100.00%> (ø)
src/data_morph/cli.py	100.00% <100.00%> (ø)
src/data_morph/data/stats.py	100.00% <100.00%> (ø)
src/data_morph/morpher.py	100.00% <100.00%> (ø)
src/data_morph/plotting/static.py	100.00% <100.00%> (ø)
tests/data/test_stats.py	100.00% <100.00%> (ø)
tests/plotting/test_animation.py	100.00% <ø> (ø)
tests/plotting/test_static.py	100.00% <100.00%> (ø)
tests/test_cli.py	100.00% <ø> (ø)

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