fix: support lookup ping api (#2791)

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.80692% with 136 lines in your changes missing coverage. Please review.

Project coverage is 67.93%. Comparing base (88fd5da) to head (19e419c).
Report is 54 commits behind head on master.

Files	Patch %	Lines
internal/server/yaml_import_export.go	62.72%	53 Missing and 10 partials ⚠️
extensions/impl/sql/lookupSource.go	68.03%	32 Missing and 7 partials ⚠️
internal/server/meta_init.go	5.88%	16 Missing ⚠️
internal/topo/node/node.go	0.00%	10 Missing ⚠️
internal/server/rest.go	42.86%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3038      +/-   ##
==========================================
- Coverage   67.97%   67.93%   -0.04%     
==========================================
  Files         353      354       +1     
  Lines       34242    34575     +333     
==========================================
+ Hits        23273    23487     +214     
- Misses       8898     8997      +99     
- Partials     2071     2091      +20     

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