Enhancement Express middleware default options on processWebhooks

[leonardo-ornelas]

Overview/summary

ProcessWebhooks method on @shopify/shopify-app-express does not allow users to change the express middleware default options, such as limit parameters. This can be limiting for some use cases Eg. big webhook payload, and I think it would be beneficial to allow users to customize it without to rewrite the whole function.

export function processWebhooks({
  api,
  config,
}: ApiAndConfigParams): ProcessWebhooksMiddleware {
  return function ({webhookHandlers}: ProcessWebhooksMiddlewareParams) {
    mountWebhooks(api, config, webhookHandlers);

    return [
      express.text({type: '*/*'}),
      async (req: Request, res: Response) => {
        await process({
          req,
          res,
          api,
          config,
        });
      },
    ];
  };
}

Eg. i would like to change

 express.text({ type: '*/*', limit: '1MB' }),

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