Add support for TypeScript Generics in router.post for better type checking of request data

[7nohe]

I've been using Inertia.js with Vue 3, and I've noticed that currently, there isn't support for TypeScript Generics when using the router.post() method. This would be very helpful for better type checking of the data parameter.

Currently, we use the method like this:

import { router } from '@inertiajs/vue3'
router.post(url, data, options)

However, I would like to have the ability to add a type for data using TypeScript Generics. Here's an example of what I would like to achieve:

import { router } from '@inertiajs/vue3'
const data = { message: 'Hi' }
router.post<{ title: string }>(url, data, options) // <- TS error

This would allow for better type checking and improved developer experience when working with Inertia.js and TypeScript.

[7nohe]

I have created PR #1537. You can now try it out.