feat: delay() api

[charlypoly]

Introduce a new API to delay an execution:

import { delay } from "@defer.run/client"
import { helloWorld } from '../defer/helloWorld';

// create a delayed execution
const delayedHelloWorld = delay(helloWorld, '1h')

delayedHelloWorld() // background execution in 1 hour

---

• QA
• fix typings
• add tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 8b808f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@defer.run/client	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@defer.run/client	0.4.0-alpha-20230202160436-6b03524	npm ↗︎ unpkg ↗︎