Delete current Installation when user logs out

[cbaker6]

Need to delete installation from the keychain when a use logs out so a new one can be generated on next login

[codecov]

Codecov Report

Merging #52 (8db0ab8) into main (f5ebaba) will decrease coverage by 0.03%.
The diff coverage is 72.00%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   76.25%   76.22%   -0.04%     
==========================================
  Files          42       42              
  Lines        3883     3886       +3     
==========================================
+ Hits         2961     2962       +1     
- Misses        922      924       +2     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseUser.swift	75.68% <72.00%> (-0.06%)	⬇️
...rces/ParseSwift/Storage/PrimitiveObjectStore.swift	84.00% <0.00%> (-4.00%)	⬇️

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