feat: add ParseFileTransferable protocol for direct file uploads

[cbaker6]

New Pull Request Checklist

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

Issue Description

All ParseFile uploads currently default to having to go to a Parse Server which then forwards to a 3rd party file storage if necessary. There's no way to directly upload files to file storage from the Swift SDK.

Related issue: #n/a

Approach

Add the ParseFileTransferable protocol which allows developers to conform to the protocol and designate how/where ParseFile's are uploaded. Any object that conforms to ParseFileTransferable can be passed during initialization of the SDK to override the default behavior.

TODOs before merging

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

[parse-github-assistant[bot]]

Thanks for opening this pull request!

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

[codecov[bot]]

Codecov Report

Merging #410 (962185f) into main (378b81a) will decrease coverage by 0.00%. The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main     #410      +/-   ##
==========================================
- Coverage   89.95%   89.95%   -0.01%     
==========================================
  Files         158      159       +1     
  Lines       15269    15275       +6     
==========================================
+ Hits        13735    13740       +5     
- Misses       1534     1535       +1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseObject.swift	89.45% <ø> (ø)
Sources/ParseSwift/Types/ParseCLP.swift	99.47% <ø> (ø)
Sources/ParseSwift/Types/ParseOperation.swift	100.00% <ø> (ø)
Sources/ParseSwift/Types/ParseConfiguration.swift	53.06% <50.00%> (-0.14%)	:arrow_down:
Sources/ParseSwift/Extensions/URLSession.swift	80.91% <95.00%> (+0.13%)	:arrow_up:
Sources/ParseSwift/Parse.swift	99.02% <100.00%> (+<0.01%)	:arrow_up:
...s/ParseSwift/Protocols/ParseFileTransferable.swift	100.00% <100.00%> (ø)
...ources/ParseSwift/Types/ParseAnalytics+async.swift	96.77% <0.00%> (+1.53%)	:arrow_up:

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