Add .with_options() method to CsvReader for easier configuration

[silannisik]

This PR implements a new .with_options() method for CsvReader to allow custom CSV read options.

Although the existing into_reader_with_file_handle function from CsvReadOptions is useful for applying custom options, this PR introduces a helper function directly on CsvReader. This new function aims simplifying adding custom csv options—similar to how CsvWriter provides its own helper methods.

Fixes #16749.

Please feel free to let me know if you have any suggestions about this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.49%. Comparing base (9092a0e) to head (0905540).

Files with missing lines	Patch %	Lines
crates/polars-io/src/csv/read/reader.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #21681   +/-   ##
=======================================
  Coverage   80.48%   80.49%           
=======================================
  Files        1605     1605           
  Lines      231858   231862    +4     
  Branches     2678     2678           
=======================================
+ Hits       186622   186639   +17     
+ Misses      44606    44594   -12     
+ Partials      630      629    -1     

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