initial commit for audit logs

[sinisaos]

Related to #159

[codecov-commenter]

Codecov Report

Merging #160 (96173db) into master (96a8a26) will increase coverage by 0.43%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   88.38%   88.82%   +0.43%     
==========================================
  Files          29       31       +2     
  Lines        1576     1637      +61     
==========================================
+ Hits         1393     1454      +61     
  Misses        183      183              

Impacted Files	Coverage Δ
piccolo_api/audit_logs/commands.py	100.00% <100.00%> (ø)
piccolo_api/audit_logs/tables.py	100.00% <100.00%> (ø)
piccolo_api/crud/endpoints.py	95.43% <100.00%> (+0.25%)	:arrow_up:

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[dantownsend]

@sinisaos I think this is really cool - thanks. Left some comments.

[sinisaos]

Remainder: when #145 is merged we can finish this.