Generify fake clientsets

This adds a generic implementation of a fake clientset, and uses it to
replace the template code in generated fake clientsets for the default
methods. The templates are preserved as-is (or as close as they can
be) for use in extensions, whether for resources or subresources.

Fake clientsets with no extensions are reduced to their main getter,
their specific struct, and their constructor. All method
implementations are provided by the generic implementation. The
dedicated struct is preserved to allow extensions and expansions to be
defined where necessary.

Instead of handling the variants (with/without list, apply) with a
complex sequence of if statements, build up an index into an array
containing the various declarations.

Similarly, instead of calling different action constructors for
namespaced and non-namespaced clientsets, assume the current behaviour
of non-namespaced action creation (equivalent to creating a namespaced
action with an empty namespace) and document that assumption in the
action implementation.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

Kubernetes-commit: b0ce65df9b74d4dc72050840d5ad067596d7b822

go.mod

@@ -27,8 +27,8 @@ require (
 	go.opentelemetry.io/otel/trace v1.28.0
 	go.uber.org/zap v1.27.0
 	golang.org/x/sys v0.26.0
-	k8s.io/apimachinery v0.0.0-20241108022104-96b97de8d6ba
-	k8s.io/client-go v0.0.0-20241108115827-ec126553e25c
+	k8s.io/apimachinery v0.0.0-20240920213627-16af2ff33fbf
+	k8s.io/client-go v0.0.0-20241127164845-55d23e26d5ef
 	k8s.io/klog/v2 v2.130.1
 	k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738
 	sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3
@@ -60,6 +60,7 @@ require (
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0 // indirect
@@ -75,9 +76,10 @@ require (
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240826202546-f6391c0de4c7 // indirect
 	google.golang.org/grpc v1.65.0 // indirect
 	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/api v0.0.0-20241108114315-3f43b5a94246 // indirect
+	k8s.io/api v0.0.0-20241127162655-f8e5e36c84f1 // indirect
 	k8s.io/kube-openapi v0.0.0-20241105132330-32ad38e42d3f // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.4.2 // indirect
 )

go.sum

@@ -200,12 +200,12 @@ gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-k8s.io/api v0.0.0-20241108114315-3f43b5a94246 h1:lTiwDILcPkCelpoYPkQ0jt8tmY0/s6Q9sM2mq2qie8g=
-k8s.io/api v0.0.0-20241108114315-3f43b5a94246/go.mod h1:jw6pQTESH9mdZL2vOK3twojvpPxipl5TpLZpPyl5ZYU=
-k8s.io/apimachinery v0.0.0-20241108022104-96b97de8d6ba h1:ghB5Iygt6Ge8UyIwW7C1kJx4kP7AUTCL9Qg6GCsUUOY=
-k8s.io/apimachinery v0.0.0-20241108022104-96b97de8d6ba/go.mod h1:HqhdaJUgQqky29T1V0o2yFkt/pZqLFIDyn9Zi/8rxoY=
-k8s.io/client-go v0.0.0-20241108115827-ec126553e25c h1:oFkwLbL3wiQ1J3kiXB3e8RekXFhWB4G3jtWxX4qz/fk=
-k8s.io/client-go v0.0.0-20241108115827-ec126553e25c/go.mod h1:qdg0yiHKZF4DimKIPqdu9N9y1VLkHDn8Jtbsblkf6O0=
+k8s.io/api v0.0.0-20241127162655-f8e5e36c84f1 h1:MTqd8524+MzN0Kxt42qAvh/aUYC18yz1BJUmfWADaDg=
+k8s.io/api v0.0.0-20241127162655-f8e5e36c84f1/go.mod h1:qs155+gTdM43TXy/cV8a8yOjDeNR8kGJc82AraJrh/c=
+k8s.io/apimachinery v0.0.0-20240920213627-16af2ff33fbf h1:ZRwu8YHh3bFbQU4NRvHB6fiovWLBouxY86wIcLd7sBA=
+k8s.io/apimachinery v0.0.0-20240920213627-16af2ff33fbf/go.mod h1:HqhdaJUgQqky29T1V0o2yFkt/pZqLFIDyn9Zi/8rxoY=
+k8s.io/client-go v0.0.0-20241127164845-55d23e26d5ef h1:vruVg7dEUvIzst/cCIMyxHj6Xh2vTpaVH9wrONW6SM4=
+k8s.io/client-go v0.0.0-20241127164845-55d23e26d5ef/go.mod h1:DtqcGpVY2YUJlRhkIBvTwD/kYAIV58FrFHjjLlNR4VM=
 k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
 k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kube-openapi v0.0.0-20241105132330-32ad38e42d3f h1:GA7//TjRY9yWGy1poLzYYJJ4JRdzg3+O6e8I+e+8T5Y=