feat: add KEDA HTTPScaledObjects support

[kahirokunn]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 11.95721% with 1399 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.43%. Comparing base (febc327) to head (69dda9f).
⚠️ Report is 169 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/apis/http/v1alpha1/zz_generated.deepcopy.go	0.00%	497 Missing ⚠️
pkg/apis/http/v1alpha1/httpscalingset_defaults.go	0.00%	95 Missing ⚠️
pkg/canary/http_scaled_object_reconciler.go	0.00%	89 Missing ⚠️
...d/http/v1alpha1/fake/fake_clusterhttpscalingset.go	0.00%	77 Missing ⚠️
.../typed/http/v1alpha1/fake/fake_httpscaledobject.go	0.00%	77 Missing ⚠️
...ed/typed/http/v1alpha1/fake/fake_httpscalingset.go	0.00%	77 Missing ⚠️
...ped/gatewayapi/v1beta1/fake/fake_referencegrant.go	22.05%	52 Missing and 1 partial ⚠️
pkg/apis/flagger/v1beta1/zz_generated.deepcopy.go	3.77%	50 Missing and 1 partial ⚠️
...g/apis/gatewayapi/v1beta1/zz_generated.deepcopy.go	41.37%	50 Missing and 1 partial ⚠️
...ntset/versioned/typed/http/v1alpha1/http_client.go	0.00%	48 Missing ⚠️
... and 30 more
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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
- Coverage   39.27%   37.43%   -1.85%     
==========================================
  Files         284      311      +27     
  Lines       22379    23872    +1493     
==========================================
+ Hits         8789     8936     +147     
- Misses      12643    13978    +1335     
- Partials      947      958      +11     

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