Rust Union support

[benjaminwinger]

I encountered a minor issue after rebasing onto the most recent commits: that the StructNodeColumn was asserting that the logical type is STRUCT, while that code is also being used for unions.

I also updated the documentation links in the rust-doc to the new locations.

[codecov]

Codecov Report

Attention: 125 lines in your changes are missing coverage. Please review.

Comparison is base (e0507dd) 89.67% compared to head (ffb7df9) 89.66%.
Report is 45 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2193      +/-   ##
==========================================
- Coverage   89.67%   89.66%   -0.01%     
==========================================
  Files         989      989              
  Lines       35389    35429      +40     
==========================================
+ Hits        31735    31769      +34     
- Misses       3654     3660       +6     

Files	Coverage Δ
src/binder/bind/bind_graph_pattern.cpp	94.72% <100.00%> (ø)
...inder/bind_expression/bind_function_expression.cpp	96.77% <100.00%> (ø)
...inder/bind_expression/bind_property_expression.cpp	93.33% <100.00%> (ø)
src/binder/bound_statement_visitor.cpp	93.54% <100.00%> (ø)
src/binder/visitor/property_collector.cpp	98.41% <100.00%> (ø)
src/common/arrow/arrow_converter.cpp	95.41% <ø> (ø)
src/common/type_utils.cpp	69.81% <100.00%> (ø)
src/common/types/date_t.cpp	89.57% <ø> (ø)
src/common/types/dtime_t.cpp	74.68% <ø> (ø)
src/common/types/types.cpp	92.17% <100.00%> (+0.03%)	⬆️
... and 100 more

... and 3 files with indirect coverage changes

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