fix: enableAutomaticLogin() should be in ParseUser

[cbaker6]

New Pull Request Checklist

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

Issue Description

enableAutomaticLogin() is under ParseObject instead of ParseUser.

Approach

Move enableAutomaticLogin() to the appropriate protocol.

TODOs before merging

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

[codecov]

Codecov Report

Merging #100 (79a9d49) into main (7a0540c) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
- Coverage   91.56%   91.47%   -0.09%     
==========================================
  Files         172      172              
  Lines       15385    15338      -47     
==========================================
- Hits        14087    14031      -56     
- Misses       1298     1307       +9     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseUser.swift	93.60% <ø> (ø)
Sources/ParseSwift/Types/ParseVersion.swift	98.61% <ø> (ø)

... and 5 files with indirect coverage changes