Support for PushNotifications

[cbaker6]

• Add setDeviceToken to ParseInstallation to properly convert deviceToken to a hex String to be used by Parse Server
• Documentation
• Testcases
• Changelog entry
• Prepare for next version release (bump project, pod spec, and jazzy)
• if #available(macOS 11.0, iOS...) doesn't work well when an older version OS is looking for a newer version than what it currently knows. This causes the SPM 11.7 (Swift 5.2) test failure. Added compiler check to work across older versions of Swift.

[codecov]

Codecov Report

Merging #78 (e5459c0) into main (7a282e1) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   79.01%   79.13%   +0.12%     
==========================================
  Files          61       62       +1     
  Lines        4903     4936      +33     
==========================================
+ Hits         3874     3906      +32     
- Misses       1029     1030       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Internal/Data+hexString.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseInstallation.swift	82.22% <100.00%> (+0.15%)	⬆️
Sources/ParseSwift/Objects/ParseObject.swift	75.94% <0.00%> (-0.29%)	⬇️

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[cbaker6]

@TomWFox can you look over the docs I added?

I still need look for the possible fix I mentioned above...

[TomWFox]

Nice 👍