Bug fix: query constraint ==

[cbaker6]

== was originally using $eq which works with Parse-Server, but isn't listed in the REST documentation. The problem is that the LiveQuery server doesn't use $eq, so this fix makes the SDK encode == in a way that's compatible with both the Parse Server and LiveQuery server.

• Fix related test cases.

[codecov]

Codecov Report

Merging #49 (a0d8a07) into main (ca096b5) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   76.63%   76.65%   +0.02%     
==========================================
  Files          42       42              
  Lines        3757     3757              
==========================================
+ Hits         2879     2880       +1     
+ Misses        878      877       -1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/Query.swift	91.54% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseObject.swift	76.84% <0.00%> (+0.32%)	⬆️

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