feat: Add a type for decoding Hook Triggers without Objects

[cbaker6]

New Pull Request Checklist

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

Issue Description

When using the SDK in CloudCode, a ParseObject is needed to decode trigger requests even at times when a trigger is not related to a ParseObject, like a trigger for a ParseFile.

Approach

ParseHookTriggerRequest has been renamed to ParseHookTriggerObjectRequest as it is used for decoding triggers related to ParseObject's. The new ParseHookTriggerRequest is similar but used for decoding requests not related to ParseObject's like ParseFile.

This decouples some of the properties in a request that are not related to each other.

TODOs before merging

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

[codecov]

Codecov Report

Merging #53 (6f36b75) into main (de696cc) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   90.39%   90.44%   +0.05%     
==========================================
  Files         163      164       +1     
  Lines       16492    16506      +14     
==========================================
+ Hits        14908    14929      +21     
+ Misses       1584     1577       -7     

Impacted Files	Coverage Δ
...es/ParseSwift/Protocols/ParseHookRequestable.swift	100.00% <ø> (ø)
...es/ParseSwift/Protocols/ParseHookTriggerable.swift	100.00% <ø> (ø)
...es/ParseSwift/Types/ParseHookFunctionRequest.swift	100.00% <ø> (ø)
...ces/ParseSwift/Types/ParseHookTriggerRequest.swift	92.85% <ø> (-7.15%)	⬇️
...rseSwift/Types/ParseHookTriggerObjectRequest.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Coding/ParseEncoder.swift	78.03% <0.00%> (+0.34%)	⬆️
Sources/ParseSwift/Coding/ParseCoding.swift	97.40% <0.00%> (+6.49%)	⬆️

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