Test ParseEncoder

[cbaker6]

Use Swift JSONEncoder testsuite to ensure ParseEncoder stability

[codecov]

Codecov Report

Merging #133 (507c67f) into main (e7dc57d) will decrease coverage by 0.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   81.43%   80.81%   -0.62%     
==========================================
  Files          65       66       +1     
  Lines        5704     6328     +624     
==========================================
+ Hits         4645     5114     +469     
- Misses       1059     1214     +155     

Impacted Files	Coverage Δ
Sources/ParseSwift/Coding/ParseEncoder.swift	75.16% <ø> (ø)

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