[ort-sys] Support explicit dynamic linking of onnxruntime

[bradneuman]

Previously, if static library files were found, the build script in ort-sys would always prefer static linking.

This PR introduces a new env variable, ORT_PREFER_DYNAMIC_LINK, that can be set (to 1 or "true") to use dynamic linking even if the static library files are present in the onnxruntime path.

Additionally, since cuda and tensorrt require dynamic linking, static linking is disabled when these features are present.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.18%. Comparing base (c882c58) to head (fbcfeca).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #295   +/-   ##
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  Coverage   53.18%   53.18%           
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  Files          34       34           
  Lines        2326     2326           
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  Hits         1237     1237           
  Misses       1089     1089           

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