[CLIENT-4631] Fix not raising client exception if an invalid map key is passed

[juliannguyen4]

• Memory leak may occur if as_map_set doesn't take ownership of as_val key and value objects on error.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.89%. Comparing base (1f81f80) to head (0ca32cb).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1026      +/-   ##
==========================================
+ Coverage   83.87%   83.89%   +0.01%     
==========================================
  Files          99       99              
  Lines       14514    14516       +2     
==========================================
+ Hits        12174    12178       +4     
+ Misses       2340     2338       -2     

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