Make ParseFileManager public

[cbaker6]

Make ParseFileManager public so developers can easily find the location of ParseFiles.

• add change log entry
• prepare for next release

[codecov]

Codecov Report

Merging #205 (a284fb2) into main (923110d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   83.12%   83.13%   +0.01%     
==========================================
  Files          76       76              
  Lines        7224     7224              
==========================================
+ Hits         6005     6006       +1     
+ Misses       1219     1218       -1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Storage/ParseFileManager.swift	90.07% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseUser.swift	82.89% <0.00%> (+0.14%)	⬆️

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