add consul config adapter

[monchickey]

Add consul implements gcfg.Adapter using consul service.

[gqcn]

@monchickey The CI failed it was missing CI service here: https://github.com/gogf/gf/blob/master/.github/workflows/gf.yml

[codecov-commenter]

Codecov Report

Patch coverage: 43.61% and project coverage change: -1.85% ⚠️

Comparison is base (7c9eefe) 79.24% compared to head (7f72744) 77.40%.

❗ Current head 7f72744 differs from pull request most recent head 9647f16. Consider uploading reports for the commit 9647f16 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2964      +/-   ##
==========================================
- Coverage   79.24%   77.40%   -1.85%     
==========================================
  Files         643      645       +2     
  Lines       52760    54145    +1385     
==========================================
+ Hits        41812    41911      +99     
- Misses       8867    10128    +1261     
- Partials     2081     2106      +25     

Flag	Coverage Δ
go-1.18-386	77.47% <43.61%> (-1.81%)	⬇️
go-1.18-amd64	?
go-1.19-386	77.35% <39.36%> (-1.79%)	⬇️
go-1.19-amd64	77.37% <43.61%> (-1.82%)	⬇️
go-1.20-386	?
go-1.20-amd64	?
go-1.21-386	77.46% <43.61%> (-1.83%)	⬇️
go-1.21-amd64	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
contrib/config/consul/consul.go	43.61% <43.61%> (ø)

... and 44 files with indirect coverage changes

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