add attributes to project

[CoderZhi]

1. Move operators out of struct operator
2. add attributes of projects, attribute_key => attribute_value

[CoderZhi]

Will make the contract upgradable in next PR

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.38%. Comparing base (d6a5be1) to head (d5b1f69).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #385   +/-   ##
========================================
  Coverage    79.38%   79.38%           
========================================
  Files           27       27           
  Lines         1048     1048           
========================================
  Hits           832      832           
  Misses         200      200           
  Partials        16       16           

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