misc: add .cargo/config.toml with native instruction codegen

[zachschuermann]

What changes are proposed in this pull request?

According to arrow docs we should ensure that we have -C target-cpu=native for rustc to generate best available instructions (SIMD, etc.) for our architecture

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.35%. Comparing base (cb70e58) to head (ed2ed89).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #772      +/-   ##
==========================================
+ Coverage   84.33%   84.35%   +0.02%     
==========================================
  Files          81       81              
  Lines       19253    19253              
  Branches    19253    19253              
==========================================
+ Hits        16237    16241       +4     
+ Misses       2211     2209       -2     
+ Partials      805      803       -2     

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