Changes for supporting Swift 5.5

[cbaker6]

Some changes are needed to support Swift 5.5 and async/await

• Refactor Task to PCKTask, this classes with Swift 5.5 introduction of Task. This name change is only reflected in the SDK. The server will still have the names without PCK. To prevent issues like this in the future, prepended all ParseCareKit class names with PCK
• Add async/await wrappers
• Add combine wrappers

[codecov]

Codecov Report

Merging #132 (366fab1) into main (e78ae4c) will increase coverage by 0.57%.
The diff coverage is 33.98%.

❗ Current head 366fab1 differs from pull request most recent head cd800d9. Consider uploading reports for the commit cd800d9 to get more accurate results

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   13.34%   13.92%   +0.57%     
==========================================
  Files          14       16       +2     
  Lines        2001     2004       +3     
==========================================
+ Hits          267      279      +12     
+ Misses       1734     1725       -9     

Impacted Files	Coverage Δ
Sources/ParseCareKit/Objects/PCKClock.swift	0.00% <0.00%> (ø)
...ParseCareKit/Protocols/PCKObjectable+combine.swift	0.00% <0.00%> (ø)
...arseCareKit/Protocols/PCKVersionable+combine.swift	0.00% <0.00%> (ø)
...ources/ParseCareKit/Protocols/PCKVersionable.swift	4.82% <0.00%> (+0.09%)	⬆️
Sources/ParseCareKit/Objects/PCKOutcome.swift	14.61% <16.66%> (ø)
Sources/ParseCareKit/ParseRemote.swift	2.60% <16.66%> (ø)
Sources/ParseCareKit/Objects/PCKContact.swift	17.61% <30.00%> (ø)
...ources/ParseCareKit/Objects/PCKHealthKitTask.swift	15.67% <30.00%> (ø)
Sources/ParseCareKit/Objects/PCKTask.swift	15.21% <30.00%> (ø)
Sources/ParseCareKit/Protocols/PCKObjectable.swift	35.71% <40.00%> (+8.54%)	⬆️
... and 4 more

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