Add typing support for hono variables in the handler

[ytkimirti]

From discord support

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https://upstash.com/docs/workflow/quickstarts/hono#step-3-create-a-workflow-endpoint in this example which showcases using hono context in the workflow serve. It only has support for Bindings. I am not able to configure or type Variables in the serve function so the handler(c) is throwing a lint error saying it cannot accept the payload.

the following is my Hono object creation code.

interface Bindings extends WorkflowBindings {
  db:MyDb
}
export const workflowsHandler = new Hono<{
  Variables: RootVariables;
  Bindings: Bindings;
}>();

[joschan21]

on a type-level the exact same, but I suggest using the Variables type provided directly by Hono:

import { Variables } from "hono/types"