add actor email

[hamedsh]

add actor_email

deleting a user from the Users table will make actor_id useless (its only a bunch of characters). by adding email as static content, it can be usable forever.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.31%. Comparing base (1ce39c0) to head (45e3064).
Report is 19 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   95.20%   95.31%   +0.10%     
==========================================
  Files          31       32       +1     
  Lines        1022     1045      +23     
==========================================
+ Hits          973      996      +23     
  Misses         49       49              

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[hramezani]

Thanks @hamedsh for this PR. Please

• Add change log entry for this change
• Add some tests to show 1. email will be logged in LogEntry model and 2. email will remain in after user deletion