fix: Properly handle from_physical for List/Array

[coastalwhite]

This fixes the following snippet panicking.

dtype = pl.List(pl.Datetime)
df = pl.Series('a', [[date(1996, 10, 5)]], dtype).to_frame()

print(df)
re = df._row_encode([(False, False, False)])
rt = re._row_decode([('a', dtype)], [(False, False, False)])
print(rt)

[coastalwhite]

@ritchie46 I think this is quite a high priority fix actually

[ritchie46]

Can you add some tests for this?

[codecov]

Codecov Report

Attention: Patch coverage is 66.92913% with 42 lines in your changes missing coverage. Please review.

Project coverage is 79.61%. Comparing base (ff95fad) to head (3cff142).
Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-core/src/chunked_array/array/mod.rs	0.00%	36 Missing ⚠️
crates/polars-core/src/series/mod.rs	84.37%	5 Missing ⚠️
...rates/polars-core/src/chunked_array/struct_/mod.rs	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20311      +/-   ##
==========================================
- Coverage   79.61%   79.61%   -0.01%     
==========================================
  Files        1567     1567              
  Lines      218453   218531      +78     
  Branches     2462     2462              
==========================================
+ Hits       173921   173980      +59     
- Misses      43965    43984      +19     
  Partials      567      567              

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