Fix non-bundled rust build

[benjaminwinger]

Only set KUZU_STATIC_DEFINE in the rust build if linking statically. If linking dynamically against the release binaries it should use the default "import" mode for the headers. It should also be possible to link against a pre-built static library, which this also preserves support for.

We're not testing the non-bundled build at the moment, so that's something that could be added to the list of things to test when setting up the other tests of the single file headers.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7308523) 89.63% compared to head (9bb90ae) 89.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2133   +/-   ##
=======================================
  Coverage   89.63%   89.63%           
=======================================
  Files         988      988           
  Lines       35729    35729           
=======================================
+ Hits        32024    32027    +3     
+ Misses       3705     3702    -3     

see 1 file with indirect coverage changes

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