[13-2] Implement class interface to Hermite functions

[MothNik]

This pull request

🦾 Features/Enhancements

• enables the use of native Python Arrays and pandas.Series as x-values for the Hermite functions
• adds the class HermiteFunctionBasis that offers the static method eval and the magic method __call__ for an object-oriented interface to the Hermite functions

🪛 Internal changes

• makes internal type handling and validation of Hermite function parameters way smarter to enable the use of native Python Arrays and pandas.Series as x-values
• makes type handling for other Hermite function parameters more open (e.g. Python AND NumPy integers/scalars because it raised an error for the NumPy ones 😬)

✅❌ Tests

• extends the tests for the Hermite function functions to properly cover all the newly allowed types for x and other parameters
• adds extensive tests for the new class HermiteFunctionBasis

It also reflects the changes from #19 and #20

[codecov[bot]]

Codecov Report

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

Files	Coverage Δ
src/robust_hermite_ft/__init__.py	100.00% <ø> (ø)
...rc/robust_hermite_ft/fourier_transform/__init__.py	100.00% <ø> (ø)
...rc/robust_hermite_ft/hermite_functions/__init__.py	100.00% <100.00%> (ø)
...st_hermite_ft/hermite_functions/_approximations.py	100.00% <100.00%> (ø)
...t_hermite_ft/hermite_functions/_class_interface.py	100.00% <100.00%> (ø)
...st_hermite_ft/hermite_functions/_func_interface.py	100.00% <100.00%> (ø)
...rmite_functions/_hermite_largest_extrema_spline.py	100.00% <ø> (ø)
...hermite_functions/_hermite_largest_roots_spline.py	100.00% <ø> (ø)
...obust_hermite_ft/hermite_functions/_numpy_funcs.py	100.00% <ø> (ø)
...c/robust_hermite_ft/hermite_functions/_validate.py	100.00% <100.00%> (ø)