Merge pull request #57059 from ericchiang/client-go/remove-openapi-import

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

client-go: remove open-api import from types

This builds off of https://github.com/kubernetes/kube-openapi/pull/21 and removes the following imports from `k8s.io/client-go/kubernetes`:

```
github.com/PuerkitoBio/purell
github.com/PuerkitoBio/urlesc
github.com/emicklei/go-restful
github.com/emicklei/go-restful/log
github.com/go-openapi/jsonpointer
github.com/go-openapi/jsonreference
github.com/go-openapi/spec
github.com/go-openapi/swag
github.com/mailru/easyjson/buffer
github.com/mailru/easyjson/jlexer
github.com/mailru/easyjson/jwriter
golang.org/x/text/cases
golang.org/x/text/internal
golang.org/x/text/internal/tag
golang.org/x/text/language
golang.org/x/text/runes
golang.org/x/text/secure/precis
golang.org/x/text/width
k8s.io/kube-openapi/pkg/common
```

/assign @sttts
/assign @mbohlool

cc @kubernetes/sig-api-machinery-pr-reviews

```release-note
NONE
```

Kubernetes-commit: f6d0632bbbf8428bfec0ca72db5103916e6248b4

vendor/k8s.io/kube-openapi/pkg/util/proto/openapi.go

@@ -58,6 +58,14 @@ type SchemaVisitor interface {
 	VisitReference(Reference)
 }
 
+// SchemaVisitorArbitrary is an additional visitor interface which handles
+// arbitrary types. For backwards compatability, it's a separate interface
+// which is checked for at runtime.
+type SchemaVisitorArbitrary interface {
+	SchemaVisitor
+	VisitArbitrary(*Arbitrary)
+}
+
 // Schema is the base definition of an openapi type.
 type Schema interface {
 	// Giving a visitor here will let you visit the actual type.
@@ -242,6 +250,23 @@ func (p *Primitive) GetName() string {
 	return fmt.Sprintf("%s (%s)", p.Type, p.Format)
 }
 
+// Arbitrary is a value of any type (primitive, object or array)
+type Arbitrary struct {
+	BaseSchema
+}
+
+var _ Schema = &Arbitrary{}
+
+func (a *Arbitrary) Accept(v SchemaVisitor) {
+	if visitor, ok := v.(SchemaVisitorArbitrary); ok {
+		visitor.VisitArbitrary(a)
+	}
+}
+
+func (a *Arbitrary) GetName() string {
+	return "Arbitrary value (primitive, object or array)"
+}
+
 // Reference implementation depends on the type of document.
 type Reference interface {
 	Schema