Control plane support log output as json

[zirain]

fixes: #6894

[zirain]

output:

{"L":"INFO","T":"2025-11-08T13:57:59.401Z","N":"provider","C":"kubernetes/controller.go:192","M":"created gatewayapi controller","runner":"provider"}
{"L":"INFO","T":"2025-11-08T13:57:59.429Z","N":"provider","C":"kubernetes/controller.go:1998","M":"ServiceImport CRD not found, skipping ServiceImport watch","runner":"provider"}
{"L":"INFO","T":"2025-11-08T13:57:59.508Z","N":"provider","C":"kubernetes/controller.go:2353","M":"Watching gatewayAPI related objects","runner":"provider"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"provider","C":"runner/runner.go:66","M":"Running provider","runner":"provider","type":"Kubernetes"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","C":"cmd/server.go:262","M":"Starting runner","name":"gateway-api"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"gateway-api","C":"runner/runner.go:90","M":"started","runner":"gateway-api"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","C":"cmd/server.go:262","M":"Starting runner","name":"xds"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"xds","C":"runner/runner.go:158","M":"loaded TLS certificate and key","runner":"xds"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"xds","C":"runner/runner.go:164","M":"configured gRPC keepalive","runner":"xds","maxConnectionAge":"10h0m0s","maxConnectionAgeGrace":"2m0s"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"xds","C":"runner/runner.go:216","M":"started","runner":"xds"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","C":"cmd/server.go:262","M":"Starting runner","name":"infrastructure"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","C":"cmd/server.go:262","M":"Starting runner","name":"admin"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"admin","C":"admin/server.go:69","M":"starting admin server","address":"127.0.0.1:19000","enablePprof":false,"enableConsole":true}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","C":"cmd/server.go:262","M":"Starting runner","name":"metrics"}
{"L":"INFO","T":"2025-11-08T13:57:59.519Z","N":"metrics","C":"metrics/register.go:202","M":"initialized metrics pull endpoint","address":"0.0.0.0:19001","endpoint":"/metrics"}
{"L":"INFO","T":"2025-11-08T13:57:59.521Z","N":"provider.controller-runtime.metrics","C":"server/server.go:208","M":"Starting metrics server","runner":"provider"}
{"L":"INFO","T":"2025-11-08T13:57:59.521Z","N":"provider.controller-runtime.metrics","C":"server/server.go:247","M":"Serving metrics server","runner":"provider","bindAddress":":8080","secure":false}
{"L":"INFO","T":"2025-11-08T13:57:59.521Z","N":"provider","C":"manager/server.go:83","M":"starting server","runner":"provider","name":"health probe","addr":"[::]:8081"}
{"L":"INFO","T":"2025-11-08T13:57:59.521Z","N":"provider.controller-runtime.webhook","C":"webhook/server.go:191","M":"Starting webhook server","runner":"provider"}
{"L":"INFO","T":"2025-11-08T13:57:59.521Z","N":"provider.controller-runtime.certwatcher","C":"certwatcher/certwatcher.go:214","M":"Updated current TLS certificate","runner":"provider","cert":"/certs/tls.crt","key":"/certs/tls.key"}

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.25%. Comparing base (fe84555) to head (c58af8f).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/logging/log.go	63.63%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7455      +/-   ##
==========================================
+ Coverage   72.23%   72.25%   +0.01%     
==========================================
  Files         231      231              
  Lines       34074    34084      +10     
==========================================
+ Hits        24615    24627      +12     
+ Misses       7680     7678       -2     
  Partials     1779     1779              

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