fix(rust): Add temporal feature gate in is_elementwise_top_level

[lukemanley]

StringFunction::Strptime is only available with feature = "temporal".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.63%. Comparing base (dc54699) to head (37b6e6d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20177   +/-   ##
=======================================
  Coverage   79.63%   79.63%           
=======================================
  Files        1564     1564           
  Lines      217478   217478           
  Branches     2473     2473           
=======================================
+ Hits       173181   173189    +8     
+ Misses      43728    43720    -8     
  Partials      569      569           

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