Updated ParseConstants for visionOS support.

[misteu]

New Pull Request Checklist

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

Issue Description

Updates ParseConstants as the SDK currently cannot be built when imported and tried to be built against visionOS target

Closes: #449

Approach

Adds visionOS platform to ParseConstants.

	#elseif os(visionOS)
	static let deviceType = "visionos"

TODOs before merging

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

[parse-github-assistant]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.42%. Comparing base (3d4bb13) to head (9064c2f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
- Coverage   90.37%   87.42%   -2.95%     
==========================================
  Files         161      161              
  Lines       16267    16208      -59     
==========================================
- Hits        14701    14170     -531     
- Misses       1566     2038     +472     

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