feat(discovery): provide an option to disable discovery debug log

[yeqown]

Description (what this PR does / why we need it):

Issue resolved

Which issue(s) this PR fixes (resolves / be part of):

fixes #1935

Other special notes for reviewer:

[daemon365]

What's this for？ Do not output resolver log？

[codecov-commenter]

Codecov Report

Merging #1942 (77b4959) into main (d0b704b) will decrease coverage by 0.05%.
The diff coverage is 83.33%.

❗ Current head 77b4959 differs from pull request most recent head 34bb27f. Consider uploading reports for the commit 34bb27f to get more accurate results

@@            Coverage Diff             @@
##             main    #1942      +/-   ##
==========================================
- Coverage   80.71%   80.66%   -0.06%     
==========================================
  Files          81       81              
  Lines        3609     3615       +6     
==========================================
+ Hits         2913     2916       +3     
- Misses        489      492       +3     
  Partials      207      207              

Impacted Files	Coverage Δ
transport/grpc/resolver/discovery/builder.go	80.76% <80.00%> (-4.34%)	⬇️
transport/grpc/resolver/discovery/resolver.go	76.78% <100.00%> (+0.42%)	⬆️

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[yeqown]

@haiyux provide an option to disable "[resolve] update instance xxx" log which is abundant and intrusive for someone and it's unstoppable now.

[Casper-Mars]

How about passing a no-output logger ? I think this is more elegant.

[yeqown]

How about passing a no-output logger ? I think this is more elegant.

you can‘t even know whether the discoveryResolver started or not.

[freezeChen]

新提供的方法DisableDebugLog()隐藏在grpc client DialInsecure()方法的内部,外部并没办法对discovery.NewBuilder()进行参数设置, 建议在 grpc client DialInsecure()的options中添加 debuglog的开关,传递至discovery.NewBuilder内部