feat: Attempt to retreive full objects on server during POST

[cbaker6]

New Pull Request Checklist

• Disclose a vulnerability.
• Link this PR to an issue.

Issue Description

• Sometimes, when creating objects, the server may return a ParsePointer instead of the realized object.
• There's an issue when using mergeable on ParseInstallation's' and properties that are automatically computed, such as appVersion are not sent to the server

Closes: FILL_THIS_OUT

Approach

• Attempt to retrieve the realized object before returning to the function call-site
• When using mergeable on ParseInstallation, always retain all automatically computed properties so the server always receives the latest update of a ParseInstallation.

TODOs before merging

• Add tests
• Add entry to changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.93%. Comparing base (e4d22f7) to head (b0f41ad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   91.75%   91.93%   +0.18%     
==========================================
  Files         179      179              
  Lines       15985    16023      +38     
==========================================
+ Hits        14667    14731      +64     
+ Misses       1318     1292      -26     

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