fix(native): Handle null correctly as JsNull, not as JsString

[ovr]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.20%. Comparing base (40b3708) to head (310d63b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9717   +/-   ##
=======================================
  Coverage   84.20%   84.20%           
=======================================
  Files         230      230           
  Lines       85315    85315           
=======================================
  Hits        71842    71842           
  Misses      13473    13473           

Flag	Coverage Δ
cubesql	84.20% <ø> (ø)

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[KSDaemon]

👍🏻 LGTM just fix cargo fmt...