feat: resource list and table output formatter

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
 }