Clear cache on logout

[cbaker6]

Make sure the cache is cleared when a user logs out

[codecov]

Codecov Report

Merging #198 (2c97307) into main (cb1a8b9) will decrease coverage by 9.73%.
The diff coverage is 100.00%.

❗ Current head 2c97307 differs from pull request most recent head fe69816. Consider uploading reports for the commit fe69816 to get more accurate results

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   83.27%   73.53%   -9.74%     
==========================================
  Files          76       58      -18     
  Lines        7203     6064    -1139     
==========================================
- Hits         5998     4459    -1539     
- Misses       1205     1605     +400     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseUser.swift	82.55% <100.00%> (-0.13%)	⬇️
Sources/ParseSwift/LiveQuery/Messages.swift	0.00% <0.00%> (-100.00%)	⬇️
Sources/ParseSwift/LiveQuery/Operations.swift	0.00% <0.00%> (-100.00%)	⬇️
Sources/ParseSwift/Operations/AddRelation.swift	0.00% <0.00%> (-100.00%)	⬇️
Sources/ParseSwift/Operations/RemoveRelation.swift	0.00% <0.00%> (-100.00%)	⬇️
...es/ParseSwift/LiveQuery/SubscriptionCallback.swift	0.00% <0.00%> (-95.84%)	⬇️
Sources/ParseSwift/LiveQuery/Subscription.swift	0.00% <0.00%> (-67.28%)	⬇️
Sources/ParseSwift/Internal/Data+hexString.swift	44.82% <0.00%> (-55.18%)	⬇️
Sources/ParseSwift/Types/ParseRelation.swift	30.26% <0.00%> (-52.64%)	⬇️
Sources/ParseSwift/Operations/ParseOperation.swift	23.69% <0.00%> (-52.03%)	⬇️
... and 43 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cb1a8b9...fe69816. Read the comment docs.