Use petgraph inside DefaultRoleManager to model relations

[kbalt]

This relation model is built after the Go implementation, but uses edges inside the graph to model relations instead of having each role store pointers in maps.

Edges with the EdgeVariant::Link are relations which in Go are modeled by the roles and users map. Edges with the EdgeVariant::Match are relations which is Go are modeled by the matched and matchedBy map.

This change brings significant speedups in benchmarks when compared against the master branch.

[casbin-bot]

@smrpn @hackerchai @PsiACE @GopherJ please review

[CLAassistant]

All committers have signed the CLA.

[hsluoyz]

@kbalt fix:

[hsluoyz]

@PsiACE

[codecov[bot]]

Codecov Report

Merging #293 (c111b47) into master (41db260) will increase coverage by 0.49%. The diff coverage is 93.72%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
+ Coverage   81.02%   81.52%   +0.49%     
==========================================
  Files          23       23              
  Lines        3342     3480     +138     
==========================================
+ Hits         2708     2837     +129     
- Misses        634      643       +9     

Impacted Files	Coverage Δ
src/adapter/file_adapter.rs	61.45% <0.00%> (+0.63%)	:arrow_up:
src/rbac/default_role_manager.rs	96.29% <95.23%> (-1.83%)	:arrow_down:
src/rbac_api.rs	89.37% <100.00%> (ø)

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[PsiACE]

Great, thank you very much for your contribution! I will check it tomorrow, can you let ci pass first?

[kbalt]

@PsiACE Any updates on this?

[PsiACE]

@PsiACE Any updates on this?

I apologise for some changes in my role that caused me to forget to give feedback earlier.

The PR looks great and I will be approving it. But before we merge, I'd like @hackerchai to help review it again.

[greenhandatsjtu]

LGTM