fix(python): Correctly parse special float values in from_repr

[alexander-beedie]

Closes #20328.

Handles inf, -inf, and nan values in the repr string.

Example

pl.from_repr(
    """
    # some sketchy float values
    Series: 'flt' [f64]
    [
        null
        +inf
        -inf
        inf
        0.0
        NaN
    ]
    >>> print("stuff")
    """
)

# shape: (6,)
# Series: 'flt' [f64]
# [
#     null
#     inf
#     -inf
#     inf
#     0.0
#     NaN
# ]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.13%. Comparing base (676f10d) to head (64140e3).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20351   +/-   ##
=======================================
  Coverage   79.13%   79.13%           
=======================================
  Files        1572     1572           
  Lines      219839   219847    +8     
  Branches     2462     2465    +3     
=======================================
+ Hits       173961   173970    +9     
+ Misses      45310    45309    -1     
  Partials      568      568           

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