feat: add query computed property to ParseObject

[cbaker6]

New Pull Request Checklist

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

Issue Description

There's currently no computed property .query on ParseObjects, the only way to get this is by using .query.

Related issue: #n/a

Approach

Add .query computed property to ParseObject and add a default value to query(_ constraints: [QueryConstraint] = []) to ensure .query() still works and doesn't break the SDK.

TODOs before merging

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

[parse-github-assistant]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[codecov]

Codecov Report

Merging #365 (97ef6ea) into main (630ee91) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
- Coverage   87.92%   87.91%   -0.01%     
==========================================
  Files         114      114              
  Lines       12207    12207              
==========================================
- Hits        10733    10732       -1     
- Misses       1474     1475       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/Query.swift	94.37% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseObject.swift	85.03% <0.00%> (-0.16%)	⬇️

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