feat: Add fetchAll method for Parse pointers

[cbaker6]

New Pull Request Checklist

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

Issue Description

Currently have to do extra work to fetch an array of ParsePointers.

Approach

Add fetchAll methods to ParsePointers so the array can be fetched directly.

TODOs before merging

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b3e48b) 91.33% compared to head (e942785) 91.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   91.33%   91.36%   +0.02%     
==========================================
  Files         175      178       +3     
  Lines       15472    15504      +32     
==========================================
+ Hits        14132    14165      +33     
+ Misses       1340     1339       -1     

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