feat: add basic control plane metrics instrumentation

[Xunzhuo]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

After: #1982
Part of: #700

[codecov]

Codecov Report

Merging #1983 (de608be) into main (fa55804) will decrease coverage by 1.10%.
The diff coverage is 31.43%.

@@            Coverage Diff             @@
##             main    #1983      +/-   ##
==========================================
- Coverage   65.53%   64.43%   -1.10%     
==========================================
  Files          92      101       +9     
  Lines       13528    13965     +437     
==========================================
+ Hits         8865     8999     +134     
- Misses       4114     4407     +293     
- Partials      549      559      +10     

Files	Coverage Δ
...ternal/infrastructure/kubernetes/infra_resource.go	81.65% <100.00%> (+2.26%)	⬆️
internal/xds/translator/runner/runner.go	69.81% <100.00%> (+0.58%)	⬆️
internal/admin/server.go	56.75% <66.66%> (ø)
internal/xds/translator/extension.go	74.66% <93.75%> (+2.27%)	⬆️
internal/cmd/server.go	17.68% <0.00%> (-0.37%)	⬇️
internal/gatewayapi/runner/runner.go	22.60% <25.00%> (-0.41%)	⬇️
internal/xds/server/runner/runner.go	28.18% <0.00%> (-0.53%)	⬇️
internal/metrics/otel_label.go	25.00% <25.00%> (ø)
internal/message/watchutil.go	77.41% <70.83%> (-22.59%)	⬇️
internal/metrics/options.go	58.82% <58.82%> (ø)
... and 9 more

... and 1 file with indirect coverage changes

[zirain]

@Xunzhuo can we close this?