fix: remove all generic shadow warnings

[cbaker6]

New Pull Request Checklist

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

Issue Description

Compiling the project in Swift 5.9 shows there's a number of generic shadows in the code.

Approach

Remove all shadowing of generic types.

TODOs before merging

• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)

[codecov]

Codecov Report

Merging #120 (a997f31) into main (e92241c) will increase coverage by 0.06%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   91.55%   91.62%   +0.06%     
==========================================
  Files         173      173              
  Lines       15425    15425              
==========================================
+ Hits        14123    14133      +10     
+ Misses       1302     1292      -10     

Impacted Files	Coverage Δ
...rces/ParseSwift/LiveQuery/LiveQueryConstants.swift	50.00% <0.00%> (ø)
Sources/ParseSwift/Types/ParseServer+async.swift	100.00% <ø> (ø)
Sources/ParseSwift/Types/ParseServer+combine.swift	95.83% <ø> (ø)
Sources/ParseSwift/LiveQuery/ParseLiveQuery.swift	70.84% <33.33%> (ø)
Sources/ParseSwift/API/API+Command.swift	88.08% <100.00%> (ø)
...urces/ParseSwift/API/API+NonParseBodyCommand.swift	80.00% <100.00%> (ø)
Sources/ParseSwift/Types/Query.swift	90.67% <100.00%> (ø)

... and 2 files with indirect coverage changes