Allow custom objectIds

[cbaker6]

Add support for custom objectIds parse-community/parse-server#6177

Close #99

To enable set allowCustomObjectId = true, it’s false by default:

ParseSwift.initialize(applicationId: "applicationId",
                               clientKey: "clientKey",
                               masterKey: "masterKey",
                               serverURL: url,
                               allowCustomObjectId: true)

• Add documentation
• Add test cases
• Fix bug with anonymous user becoming a real user and the authData sent to the server was incorrect
• Add changelog entry
• Prepare for 1.2.2 release

[codecov]

Codecov Report

Merging #100 (07e47f0) into main (fa74a7c) will increase coverage by 0.29%.
The diff coverage is 81.60%.

❗ Current head 07e47f0 differs from pull request most recent head 5880325. Consider uploading reports for the commit 5880325 to get more accurate results

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
+ Coverage   80.66%   80.96%   +0.29%     
==========================================
  Files          65       65              
  Lines        5411     5415       +4     
==========================================
+ Hits         4365     4384      +19     
+ Misses       1046     1031      -15     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseUser.swift	81.06% <78.26%> (+1.90%)	⬆️
...Authentication/Protocols/ParseAuthentication.swift	74.04% <84.00%> (+3.95%)	⬆️
Sources/ParseSwift/Parse.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Protocols/Objectable.swift	85.71% <100.00%> (+1.33%)	⬆️
Sources/ParseSwift/Storage/ParseFileManager.swift	89.39% <0.00%> (-0.76%)	⬇️
Sources/ParseSwift/Objects/ParseObject.swift	76.42% <0.00%> (ø)
Sources/ParseSwift/Objects/ParseInstallation.swift	82.81% <0.00%> (+0.20%)	⬆️

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