Fix server responses and saving of ParseObjects

[cbaker6]

• show fetching example of server updates not being saved on local device (commit). Fixed by removing FetchResponse (commit)
• persist server response of all ParseObjects during fetch and fetchAll. fetchAll in the JS and Objc API's query for fetch based on a list of objectIds. Parse-Swift does the samething now. FetchResponse was deleted as it's not needed and isn't versatile enough to support all ParseObjects.
• add deleteAll
• add/tested playgrounds examples of sync/async: fetch, fetchAll, deleteAll
• clean up CI

[codecov]

Codecov Report

Merging #34 (8723753) into main (0e91753) will increase coverage by 0.17%.
The diff coverage is 73.49%.

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   71.46%   71.64%   +0.17%     
==========================================
  Files          30       30              
  Lines        1791     1862      +71     
==========================================
+ Hits         1280     1334      +54     
- Misses        511      528      +17     

Impacted Files	Coverage Δ
Sources/ParseSwift/API/BatchUtils.swift	77.77% <0.00%> (+14.14%)	⬆️
Sources/ParseSwift/API/Responses.swift	54.16% <ø> (-7.91%)	⬇️
...ources/ParseSwift/Object Protocols/ParseUser.swift	80.45% <ø> (ø)
Sources/ParseSwift/API/API+Commands.swift	63.30% <73.07%> (+1.12%)	⬆️
...rces/ParseSwift/Object Protocols/ParseObject.swift	78.54% <75.00%> (-1.24%)	⬇️

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[cbaker6]

@TomWFox can you look over the docs and some of the throw errors I added? I particularly added new documentation for deleteAll and added warnings to both fetchAlls.

[cbaker6]

@pranjalsatija can you review this?

[TomWFox]

Docs look good 👍

[cbaker6]

@TomWFox can you change the branch protections from "deploy_docs" to "docs"?