feat!: Allow transposing an empty DataFrame

[nameexhaustion]

Before

pl.DataFrame().transpose()
# polars.exceptions.NoDataError: unable to transpose an empty DataFrame

After

pl.DataFrame().transpose()
shape: (0, 0)
┌┐
╞╡
└┘

pl.DataFrame(schema={"a": pl.Int32, "b": pl.Int32}).transpose()
shape: (2, 0)
┌┐
╞╡
└┘

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.83%. Comparing base (c50a014) to head (dbc599e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24380      +/-   ##
==========================================
+ Coverage   81.81%   81.83%   +0.01%     
==========================================
  Files        1680     1680              
  Lines      227632   227638       +6     
  Branches     2919     2920       +1     
==========================================
+ Hits       186239   186281      +42     
+ Misses      40663    40626      -37     
- Partials      730      731       +1     

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