Support running benchmark on load_file using native support

[tatiana]

Based on the environment variable ASTRO_ENABLE_NATIVE_LOAD. Enabled by default.

[codecov[bot]]

Codecov Report

Merging #550 (855e77d) into main (2c7eab1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #550   +/-   ##
=======================================
  Coverage   92.43%   92.43%           
=======================================
  Files          40       40           
  Lines        1573     1573           
  Branches      204      204           
=======================================
  Hits         1454     1454           
  Misses         93       93           
  Partials       26       26           

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