Short-circuited boolean evaluation in GrowableList

[ritchie46]

If the argument use_validity is set to true the checks for null count are redundant. This PR makes that the check is skipped in that case.

[codecov]

Codecov Report

Merging #228 (0c0595f) into main (7dd1cff) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #228   +/-   ##
=======================================
  Coverage   76.93%   76.93%           
=======================================
  Files         229      229           
  Lines       19529    19529           
=======================================
  Hits        15025    15025           
  Misses       4504     4504           

Impacted Files	Coverage Δ
src/array/growable/list.rs	98.40% <100.00%> (ø)

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