replace Box by Arc<RwLock> && add get_model, get_mut_model for Model.…

[0x8f701]

No description provided.

[0x8f701]

If I understood correctly, we need to share the same role manager with all the assertions instead of just cloning to have their own role manager.

So I changed Box to Arc<RwLock> to achieve this.

BTW, since now model field of Model is private, it's impossible to implement external adapters, it breaks diesel-adapter. To solve this, I added get_model, get_mut_model, get_policy get_mut_policy functions

[0x8f701]

@hsluoyz Could you review? Thx.

[codecov]

Codecov Report

Merging #44 into master will decrease coverage by 0.73%.
The diff coverage is 55.81%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage      87%   86.26%   -0.74%     
==========================================
  Files          12       12              
  Lines        1954     1966      +12     
==========================================
- Hits         1700     1696       -4     
- Misses        254      270      +16

Impacted Files	Coverage Δ
src/rbac/default_role_manager.rs	90.78% <0%> (-1.78%)	⬇️
src/adapter/file_adapter.rs	47.91% <10%> (-2.09%)	⬇️
src/enforcer.rs	85.34% <100%> (-0.05%)	⬇️
src/rbac_api.rs	85.26% <100%> (ø)	⬆️
src/model.rs	93.55% <61.9%> (-1.39%)	⬇️
src/rbac/role_manager.rs	0% <0%> (-100%)	⬇️

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[hsluoyz]

lgtm