feat: Support only watching key resources in one namespace

[CH3CHO]

Ⅰ. Describe what this PR did

Support only watching key resources in one namespace. User can use --watchNamespace parameter to restrict watching logics to a certain namespace.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.40678% with 21 lines in your changes missing coverage. Please review.

Project coverage is 43.39%. Comparing base (ef31e09) to head (d26ae4e).
Report is 323 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/ingress/kube/http2rpc/controller.go	55.55%	3 Missing and 1 partial ⚠️
pkg/ingress/kube/kingress/controller.go	63.63%	3 Missing and 1 partial ⚠️
pkg/ingress/kube/mcpbridge/controller.go	55.55%	3 Missing and 1 partial ⚠️
pkg/ingress/kube/wasmplugin/controller.go	55.55%	3 Missing and 1 partial ⚠️
pkg/ingress/translation/translation.go	60.00%	1 Missing and 1 partial ⚠️
pkg/ingress/config/ingress_config.go	83.33%	1 Missing ⚠️
pkg/ingress/config/kingress_config.go	66.66%	1 Missing ⚠️
pkg/ingress/kube/ingressv1/controller.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1821      +/-   ##
==========================================
+ Coverage   35.91%   43.39%   +7.48%     
==========================================
  Files          69       76       +7     
  Lines       11576    12301     +725     
==========================================
+ Hits         4157     5338    +1181     
+ Misses       7104     6629     -475     
- Partials      315      334      +19     

Files with missing lines	Coverage Δ
pkg/bootstrap/server.go	58.20% <100.00%> (-0.19%)	⬇️
pkg/ingress/kube/ingress/controller.go	59.66% <100.00%> (-0.70%)	⬇️
pkg/ingress/kube/secret/controller.go	100.00% <100.00%> (ø)
pkg/ingress/config/ingress_config.go	12.99% <83.33%> (-0.89%)	⬇️
pkg/ingress/config/kingress_config.go	16.92% <66.66%> (-0.05%)	⬇️
pkg/ingress/kube/ingressv1/controller.go	5.28% <0.00%> (+0.06%)	⬆️
pkg/ingress/translation/translation.go	23.33% <60.00%> (ø)
pkg/ingress/kube/http2rpc/controller.go	45.45% <55.55%> (ø)
pkg/ingress/kube/kingress/controller.go	44.36% <63.63%> (+1.66%)	⬆️
pkg/ingress/kube/mcpbridge/controller.go	45.45% <55.55%> (ø)
... and 1 more

... and 60 files with indirect coverage changes

[johnlanni]

LGTM