CLI: Support getting metadata from metadataCenter

[Leospard]

What this PR does:

Which issue(s) this PR fixes:
Fixes #

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• All ut passed (run 'go test ./...' in project root)
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• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[codecov-commenter]

Codecov Report

Merging #2066 (0b2095e) into 3.0 (aab693f) will decrease coverage by 0.00%.
The diff coverage is 61.33%.

@@            Coverage Diff             @@
##              3.0    #2066      +/-   ##
==========================================
- Coverage   44.59%   44.59%   -0.01%     
==========================================
  Files         283      281       -2     
  Lines       17073    16836     -237     
==========================================
- Hits         7614     7508     -106     
+ Misses       8653     8540     -113     
+ Partials      806      788      -18     

Impacted Files	Coverage Δ
cluster/cluster/zoneaware/cluster_interceptor.go	40.00% <ø> (ø)
cluster/router/tag/router.go	59.64% <ø> (ø)
common/url.go	59.50% <0.00%> (+0.45%)	⬆️
config/config_loader.go	17.56% <0.00%> (ø)
config/consumer_config.go	22.58% <0.00%> (ø)
config/graceful_shutdown.go	3.88% <0.00%> (ø)
config/provider_config.go	41.53% <0.00%> (ø)
config/service_config.go	53.04% <0.00%> (ø)
metadata/identifier/base_metadata_identifier.go	86.48% <0.00%> (-7.64%)	⬇️
metadata/report/delegate/delegate_report.go	26.49% <0.00%> (ø)
... and 20 more

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[cjphaha]

LGTM，pls updae the readme