Improve query hint

[cbaker6]

A query hint can now be set using a method and its returned type is automatically inferred. In addition, a hint can now be any Encodable type instead of just a String. This is a breaking change if you were using hint.

• Add method for hint and make it accept an Encodable argument
• Add documentation
• Fix playground example
• Fix tests
• Add changelog entry
• Prepare for new release

[codecov]

Codecov Report

Merging #119 (7716860) into main (db0fdea) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
- Coverage   80.90%   80.87%   -0.04%     
==========================================
  Files          65       65              
  Lines        5593     5589       -4     
==========================================
- Hits         4525     4520       -5     
- Misses       1068     1069       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/Query+combine.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Types/Query.swift	90.68% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseUser.swift	81.52% <0.00%> (-0.16%)	⬇️

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