Utility function to invoke a form action

Describe the problem

Currently form's action can only be used with a HTML <form>

<form method="POST"  action="?/load" use:enhance>
    <button type="submit">CALL</button>
</form>

It would be nice to be able to call them via a Javascript function...

Describe the proposed solution

We could have a function to call any action.
Exemple :

async function doSomething() {
   const data = await callAction('?/load', { /* an object that represents the POST parameters */ })
   // ... using data
}

Even better, maybe we could have typed functions automatically generated by Sveltekit :

<script lang="ts">
    import { load } from './$actions'; // Generated by sveltekit, based on actions defined on +page.server.ts

    async function doSomething() {
        const data = await load( { /* an object that represents the POST parameters */ } ); 
        // ... using data (which is correctly typed)
    }
</script>

Alternatives considered

No response

Importance

nice to have

Additional Information

No response

Start with the form action flow using <form action="?/load" use:enhance> and the +page.server.ts actions described in the issue. Determine the API for invoking an action from JavaScript and whether generated $actions functions are in scope; done means the behavior, parameters, return data, and typing are specified clearly enough to implement and test.