fix: casbin mysql adapter import error

[colynn]

Which changes (Bug/Feature):

Fixes casbin mysql adapter import error

Special notes for reviewers:

change casbin beego-orm-adapter change to v2

[codecov-commenter]

Codecov Report

Merging #114 (37bd58f) into v1.5.0-feat-app-refactor (574f23c) will not change coverage.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##           v1.5.0-feat-app-refactor    #114   +/-   ##
========================================================
  Coverage                      4.67%   4.67%           
========================================================
  Files                            10      10           
  Lines                          1454    1454           
========================================================
  Hits                             68      68           
  Misses                         1384    1384           
  Partials                          2       2           

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[fanhousanbu]

LGTM

[colynn]

casbin beego orm change to pkg/beego-orm-adapter