feat: resource list and table output formatter

core/interfaces/handler.go

@@ -19,7 +19,7 @@ type ResourceHandler interface {
 }
 
 type GetHandler interface {
-	Get(ctx context.Context, params params.Container) ([]any, error)
+	Get(ctx context.Context, params params.Container) (*ResourceList, error)
 }
 
 type Verb string

core/interfaces/output.go

@@ -1,7 +1,14 @@
 package interfaces
 
-import "io"
+import (
+	"io"
+)
 
 type Formatter interface {
-	Format(object []any) (io.Reader, error)
+	Format(object *ResourceList) (io.Reader, error)
+}
+
+type TableOutput interface {
+	ColumnNames() []string
+	Columns() []any
 }

core/interfaces/resource.go

@@ -0,0 +1,12 @@
+package interfaces
+
+type Resource interface {
+	Kind() string
+
+	Name() string
+}
+
+type ResourceList struct {
+	ItemKind string
+	Items    []Resource
+}