Sending events in local dev environment should not fail if the local devserver is not running

[mmachatschek]

Is your feature request related to a problem? Please describe.
When developing e.g. a CMS it's not always essential to have the local inngest dev server running in order for the app to work.

When sending an event, most of the time you'll have hooks in your CMS that call inngest.send() to trigger events on the system. If the local dev server isn't running, the Inngest SDK will try to send the event to the official https://inn.gs/ which fails with an 401 Event key Not Found error.

I want an option locally to make the inngest SDK silently fail instead throwing an error if the inngest event could not be sent.

Describe the solution you'd like
A flag that will allow allowSendingEventsWithoutDevServer

Describe alternatives you've considered

The workaround I implemented looks like this:

export const inngest = new Inngest({
  name: 'app',
  inngestBaseUrl: process.env.NODE_ENV === 'development' ? 'http://localhost:8288/' : undefined,
  fetch:
    process.env.NODE_ENV === 'development'
      ? async (input: RequestInfo | URL, init?: RequestInit) => {
          try {
            const response = await fetch(input, init);

            return response;
          } catch (e) {
            console.warn(
              'Local inngest dev server not running. Events not being processed. Start the dev server with "npx inngest-cli@latest dev"'
            );
            return {
              status: 200,
            } as Response;
          }
        }
      : undefined,
});