Fix service discovery subscription

[chickenlj]

1. Separate registry subscription from service discovery subscription by extending Directory
2. Wait for instance notification on service discovery subscription.

[codecov-commenter]

Codecov Report

Merging #2480 (9dcd037) into main (e8b4ab5) will decrease coverage by 0.03%.
The diff coverage is 29.26%.

❗ Current head 9dcd037 differs from pull request most recent head cbad419. Consider uploading reports for the commit cbad419 to get more accurate results

@@            Coverage Diff             @@
##             main    #2480      +/-   ##
==========================================
- Coverage   44.80%   44.78%   -0.03%     
==========================================
  Files         270      270              
  Lines       18338    18354      +16     
==========================================
+ Hits         8217     8220       +3     
- Misses       9238     9250      +12     
- Partials      883      884       +1     

Files	Coverage Δ
common/match.go	0.00% <ø> (ø)
config/otel_config.go	46.51% <ø> (ø)
config/router_config.go	77.19% <ø> (ø)
config_center/configurator/override.go	59.74% <ø> (ø)
registry/protocol/protocol.go	72.10% <100.00%> (+1.41%)	⬆️
registry/base_configuration_listener.go	0.00% <0.00%> (ø)
...ediscovery/service_mapping_change_listener_impl.go	0.00% <0.00%> (ø)
cluster/directory/static/directory.go	60.46% <60.00%> (-6.21%)	⬇️
config_center/mock_dynamic_config.go	0.00% <0.00%> (ø)
cluster/directory/base/directory.go	45.71% <40.00%> (ø)
... and 2 more

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[FoghostCn]

LGTM

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information