Add ParseBytes and ParsePolygon

[cbaker6]

Adds two missing Parse types to the Swift SDK: ParseBytes and ParsePolygon.

• add ParseBytes
• add ParsePolygon
• (Breaking change) improve ParsePolygon by making the initializer throw if a geo point is out of bounds instead of asserting
• fix withinPolygon(key: String, points: [ParseGeoPoint]) to make it send an array of doubles instead of an array of GeoPoint's
• add withinPolygon(key: String, polygon: ParsePolygon)
• add test cases
• add playground examples

[codecov]

Codecov Report

Merging #190 (f426531) into main (87c4367) will increase coverage by 0.23%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   82.63%   82.86%   +0.23%     
==========================================
  Files          71       73       +2     
  Lines        6823     6922      +99     
==========================================
+ Hits         5638     5736      +98     
- Misses       1185     1186       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/ParseBytes.swift	94.44% <94.44%> (ø)
Sources/ParseSwift/Types/ParsePolygon.swift	96.00% <96.00%> (ø)
Sources/ParseSwift/Types/ParseGeoPoint.swift	98.36% <100.00%> (+0.02%)	⬆️
Sources/ParseSwift/Types/Query.swift	94.47% <100.00%> (+0.20%)	⬆️
Sources/ParseSwift/Objects/ParseUser.swift	81.64% <0.00%> (+0.15%)	⬆️
Sources/ParseSwift/Coding/AnyEncodable.swift	61.84% <0.00%> (+0.65%)	⬆️

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