Remove deletion of Anonymous User on logout

[dplewis]

Based on conversation here

• Remove deletion on logout
• Remove deletion on setCurrentUser
• Exposes registered on AnonymousUtils

[codecov]

Codecov Report

Merging #1324 (4809af0) into master (7d28956) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head 4809af0 differs from pull request most recent head d36a22d. Consider uploading reports for the commit d36a22d to get more accurate results

@@             Coverage Diff             @@
##            master    #1324      +/-   ##
===========================================
- Coverage   100.00%   99.94%   -0.06%     
===========================================
  Files           60       60              
  Lines         5853     5847       -6     
  Branches      1313     1311       -2     
===========================================
- Hits          5853     5844       -9     
- Misses           0        3       +3     

Impacted Files	Coverage Δ
src/AnonymousUtils.js	100.00% <100.00%> (ø)
src/ParseUser.js	99.57% <100.00%> (-0.43%)	⬇️
src/ParseObject.js	99.89% <0.00%> (-0.11%)	⬇️

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[davimacedo]

It looks good to me and makes more sense now. Should we classify it as a breaking change?