refactor zk dynamic configuration listener

[Mulavar]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #1665 (2909c83) into 3.0 (c4fa4a0) will decrease coverage by 0.21%.
The diff coverage is 3.07%.

❗ Current head 2909c83 differs from pull request most recent head 77f3730. Consider uploading reports for the commit 77f3730 to get more accurate results

@@            Coverage Diff             @@
##              3.0    #1665      +/-   ##
==========================================
- Coverage   41.36%   41.15%   -0.22%     
==========================================
  Files         255      254       -1     
  Lines       14664    14621      -43     
==========================================
- Hits         6066     6017      -49     
- Misses       7899     7905       +6     
  Partials      699      699              

Impacted Files	Coverage Δ
config/consumer_config.go	21.42% <0.00%> (ø)
remoting/zookeeper/client.go	0.00% <0.00%> (ø)
remoting/zookeeper/listener.go	0.00% <0.00%> (ø)
cluster/router/v3router/router_chain.go	39.39% <12.50%> (-2.41%)	⬇️
config/root_config.go	40.93% <0.00%> (-5.52%)	⬇️
...tocol/rest/server/server_impl/go_restful_server.go	41.37% <0.00%> (-3.45%)	⬇️
config/registry_config.go	18.84% <0.00%> (-1.67%)	⬇️
cluster/cluster/base/cluster_invoker.go	24.17% <0.00%> (-0.27%)	⬇️
common/url.go	61.03% <0.00%> (-0.10%)	⬇️
protocol/result.go	0.00% <0.00%> (ø)
... and 5 more

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[LaurenceLiZhixin]

@Mulavar Check Conflict and I would merge it.

[Mulavar]

@Mulavar Check Conflict and I would merge it.

finished, thanks.

[binbin0325]

LGTM