feat(cubesql): Allow providing API type when getting load request meta

[MazterQyou]

This PR adds api_type argument to get_load_request_meta function, allowing to provide a custom API type.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.34%. Comparing base (18909fe) to head (473a8e9).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
rust/cubesql/cubesql/src/sql/postgres/shim.rs	71.42%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9202   +/-   ##
=======================================
  Coverage   83.34%   83.34%           
=======================================
  Files         227      227           
  Lines       81062    81062           
=======================================
  Hits        67560    67560           
  Misses      13502    13502           

Flag	Coverage Δ
cubesql	83.34% <84.61%> (ø)

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