feat: add error response support to actions

tests/mocks/actions.ts

@@ -1,12 +1,16 @@
 import z from "zod";
 
 import { action } from "../../libraries/action.ts";
+import { BadRequestError } from "../../mod.ts";
 
 export const addTwoNumbers = action
   .make("addTwoNumbers")
   .input({ a: z.number(), b: z.number() })
   .output({ added: z.number() })
   .handle(async ({ a, b }) => {
+    if (a < 0 || b < 0) {
+      return new BadRequestError("Invalid input numbers added");
+    }
     return {
       added: a + b,
     };