feat(sysadvisor): add healthz check

[zzzzhhb]

What type of PR is this?

Enhancements

What this PR does / why we need it:

add healthz check

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 54.42177% with 67 lines in your changes are missing coverage. Please review.

Project coverage is 55.52%. Comparing base (b122f7b) to head (f1f8720).

Files	Patch %	Lines
pkg/agent/evictionmanager/manager.go	10.34%	26 Missing ⚠️
.../agent/metric/provisioner/malachite/provisioner.go	17.24%	24 Missing ⚠️
...t/evictionmanager/plugin/memory/system_pressure.go	62.50%	6 Missing ⚠️
pkg/agent/evictionmanager/conditions.go	0.00%	5 Missing ⚠️
pkg/agent/resourcemanager/fetcher/manager.go	88.88%	1 Missing and 1 partial ⚠️
pkg/agent/sysadvisor/plugin/metacache/metacache.go	75.00%	1 Missing ⚠️
...nt/sysadvisor/plugin/qosaware/server/cpu_server.go	66.66%	1 Missing ⚠️
...sysadvisor/plugin/qosaware/server/memory_server.go	66.66%	1 Missing ⚠️
pkg/metaserver/agent/pod/pod.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #520      +/-   ##
==========================================
- Coverage   55.67%   55.52%   -0.16%     
==========================================
  Files         552      551       -1     
  Lines       59419    59507      +88     
==========================================
- Hits        33083    33041      -42     
- Misses      22899    23031     +132     
+ Partials     3437     3435       -2     

Flag	Coverage Δ
unittest	55.52% <54.42%> (-0.16%)	⬇️

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