Include functions from arrow feature in docs.rs rust docs

[benjaminwinger]

The arrow feature currently shows up on docs.rs (https://docs.rs/crate/kuzu/0.0.7/features), but the iter_arrow function it provides doesn't, since the arrow feature is disabled by default. However you can set the features used to build the docs on docs.rs via a docs.rs-specific table in Cargo.toml.

This won't have any effect until the next release, but the docs can be built manually with the arrow feature (e.g. DOCS_RS=1 cargo build --features arrow (setting the DOCS_RS env variable skips building the kuzu C++ library since it's not needed for documentation)).

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2c45803) 89.86% compared to head (53c1bc9) 89.86%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1951   +/-   ##
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  Coverage   89.86%   89.86%           
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  Files         873      873           
  Lines       32066    32066           
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  Hits        28817    28817           
  Misses       3249     3249           

see 2 files with indirect coverage changes

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