chore: import upstream snapshot with attribution

spec/fixtures/custom_plugins/kong/plugins/admin-api-method/api.lua

@@ -0,0 +1,19 @@
+return {
+  ["/method_without_exit"] = {
+    GET = function()
+      kong.response.set_status(201)
+      kong.response.set_header("x-foo", "bar")
+      ngx.print("hello")
+    end,
+  },
+  ["/parsed_params"] = {
+    -- The purpose of the dummy filter is to let `parse_params`
+    -- of api/api_helpers.lua to be called twice.
+    before = function(self, db, helpers, parent)
+    end,
+
+    POST = function(self, db, helpers, parent)
+      kong.response.exit(200, self.params)
+    end,
+  },
+}