casbin: add EnforceHandler to allow custom callback to handle enforcing.

[aldas]

casbin:

• add EnforceHandler to allow custom callback to handle enforcing.
• add ErrorHandler to allow custom handling of errors

CI:

• run staticcheck only for latest Go version. Adding honnef.co/go/tools/cmd/staticcheck in CI flow causes dependency problems with older Go versions with we also support.

This should be enought to handle cases for: #58, #61 and #65

[codecov[bot]]

Codecov Report

Merging #66 (d222dcd) into master (4d116ee) will increase coverage by 1.35%. The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   55.41%   56.76%   +1.35%     
==========================================
  Files           8        8              
  Lines         462      643     +181     
==========================================
+ Hits          256      365     +109     
- Misses        186      256      +70     
- Partials       20       22       +2     

Impacted Files	Coverage Δ
casbin/casbin.go	89.13% <92.85%> (+4.51%)	:arrow_up:
zipkintracing/tracing.go	63.73% <0.00%> (-5.02%)	:arrow_down:
session/session.go	88.46% <0.00%> (-1.02%)	:arrow_down:
pprof/pprof.go	100.00% <0.00%> (ø)
jaegertracing/body_dump_response_writer.go	50.00% <0.00%> (ø)
jaegertracing/jaegertracing.go	48.79% <0.00%> (+2.02%)	:arrow_up:
prometheus/prometheus.go	51.94% <0.00%> (+2.50%)	:arrow_up:
zipkintracing/response_writer.go	21.27% <0.00%> (+5.27%)	:arrow_up:

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[aldas]

@lammel could you review

[aldas]

@lammel ping

[mcauto]

LGTM :) Why not release it yet?

[aldas]

Should be ok now. Tagged a new release - 0.12.0.