Skip building kuzu when building docs for docs-rs

[benjaminwinger]

docs.rs, which builds and hosts rust documentation, doesn't allow networked builds, however building the docs works fine if we just skip the cmake build and just build the rust code.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (761585c) 90.93% compared to head (680dfa6) 90.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1775      +/-   ##
==========================================
- Coverage   90.93%   90.93%   -0.01%     
==========================================
  Files         774      774              
  Lines       28331    28331              
==========================================
- Hits        25764    25763       -1     
- Misses       2567     2568       +1     

see 1 file with indirect coverage changes

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