fix: query findAll() throwing hang risk warning

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

findAll on older versions of Swift needed to run synchronously to fetch results. This causes newer versions of Xcode to throw warnings.

Close #13

Approach

Use async/await on newer versions of Swift for findAll()

TODOs before merging

• Add tests
• Add entry to changelog

[codecov-commenter]

Codecov Report

Merging #14 (049876a) into main (4a52629) will decrease coverage by 0.23%.
The diff coverage is 90.69%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   87.90%   87.66%   -0.24%     
==========================================
  Files         279      161     -118     
  Lines       68622    16347   -52275     
==========================================
- Hits        60323    14331   -45992     
+ Misses       8299     2016    -6283     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/Query.swift	88.05% <90.69%> (+0.34%)	⬆️
Sources/ParseSwift/Storage/ParseFileManager.swift	86.15% <0.00%> (-6.67%)	⬇️
...ources/ParseSwift/Storage/ParseKeyValueStore.swift	91.66% <0.00%> (-5.56%)	⬇️
Sources/ParseSwift/Types/ParseAnalytics.swift	90.74% <0.00%> (-1.45%)	⬇️
Sources/ParseSwift/Storage/KeychainStore.swift	95.44% <0.00%> (-1.14%)	⬇️
Sources/ParseSwift/Parse.swift	98.38% <0.00%> (-0.81%)	⬇️
Sources/ParseSwift/Coding/AnyEncodable.swift	62.29% <0.00%> (-0.55%)	⬇️
Sources/ParseSwift/Objects/ParseInstallation.swift	74.27% <0.00%> (-0.17%)	⬇️
Sources/ParseSwift/Objects/ParseUser.swift	77.55% <0.00%> (-0.08%)	⬇️
...rces/ParseSwift/Types/ParseAnalytics+combine.swift	100.00% <0.00%> (ø)
... and 122 more

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