Allow Dart core types in Query return type.

[dkaera]

Implemented basic logic to support Dart core types for returning in Query methods.

[codecov-commenter]

Codecov Report

Merging #691 (9c8da43) into develop (3d6b9a1) will increase coverage by 0.19%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #691      +/-   ##
===========================================
+ Coverage    90.57%   90.76%   +0.19%     
===========================================
  Files           10       11       +1     
  Lines          191      195       +4     
===========================================
+ Hits           173      177       +4     
  Misses          18       18              

Flag	Coverage Δ
floor	90.76% <100.00%> (+0.19%)	:arrow_up:

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Impacted Files	Coverage Δ
floor/lib/src/adapter/query_adapter.dart	95.23% <100.00%> (+0.23%)	:arrow_up:
floor/lib/src/util/string_utils.dart	100.00% <100.00%> (ø)

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