Make all types CustomStringConvertible

[cbaker6]

Allow all Parse types to be used by string interpolation: "My ParseObject: \(object)"

• Make all types conform to CustomStringConvertible
• Add test cases

[codecov]

Codecov Report

Merging #185 (fe6881a) into main (715b553) will increase coverage by 0.04%.
The diff coverage is 89.13%.

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   82.38%   82.42%   +0.04%     
==========================================
  Files          71       71              
  Lines        6705     6749      +44     
==========================================
+ Hits         5524     5563      +39     
- Misses       1181     1186       +5     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/ParseGeoPoint.swift	98.33% <75.00%> (+0.05%)	⬆️
Sources/ParseSwift/Types/ParseFile.swift	85.45% <85.71%> (+<0.01%)	⬆️
Sources/ParseSwift/Types/ParseRelation.swift	82.89% <85.71%> (+0.28%)	⬆️
Sources/ParseSwift/Types/ParseVersion.swift	98.68% <85.71%> (-1.32%)	⬇️
Sources/ParseSwift/Types/Pointer.swift	80.85% <85.71%> (+0.85%)	⬆️
Sources/ParseSwift/Objects/ParseObject.swift	77.39% <100.00%> (+0.12%)	⬆️
Sources/ParseSwift/Types/ParseACL.swift	88.88% <100.00%> (+0.14%)	⬆️
Sources/ParseSwift/Types/ParseAnalytics.swift	99.10% <100.00%> (+0.01%)	⬆️
Sources/ParseSwift/Types/ParseCloud.swift	96.96% <100.00%> (+0.19%)	⬆️
Sources/ParseSwift/Types/ParseConfig.swift	95.89% <100.00%> (+0.11%)	⬆️
... and 4 more

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