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 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.