Improve AppleAuthentication

[cbaker6]

When using Apple Sign In, the identityToken is provide as type Data. This fix allows ParseAuthentication to accept the identityToken directly instead of requiring the developer to convert it.

• Add fix
• Update test cases

[codecov]

Codecov Report

Merging #81 (732d877) into main (40ffa99) will decrease coverage by 0.19%.
The diff coverage is 57.57%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   78.94%   78.74%   -0.20%     
==========================================
  Files          63       63              
  Lines        5020     5039      +19     
==========================================
+ Hits         3963     3968       +5     
- Misses       1057     1071      +14     

Impacted Files	Coverage Δ
...rseSwift/Authentication/3rd Party/ParseApple.swift	65.97% <57.57%> (-9.67%)	⬇️
Sources/ParseSwift/Objects/ParseObject.swift	75.94% <0.00%> (-0.29%)	⬇️
Sources/ParseSwift/Objects/ParseUser.swift	76.14% <0.00%> (+0.17%)	⬆️

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