refactor(rust): chrono's ParseErrorKind is now public

[IvanIsCoding]

Ref chronotope/chrono#588

This is a minor clean up to address a TODO. The current version of chrono has ParseErrorKind as a public enum. Hence, polars-time no longer needs to define its own enum and use std::mem::transmute to convert between the two types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.86%. Comparing base (b8ac923) to head (7b166fa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17201      +/-   ##
==========================================
+ Coverage   80.82%   80.86%   +0.03%     
==========================================
  Files        1464     1464              
  Lines      192019   192017       -2     
  Branches     2744     2744              
==========================================
+ Hits       155196   155267      +71     
+ Misses      36312    36239      -73     
  Partials      511      511              

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[ritchie46]

Nice TODO hunt. 👍