Allow <Form /> to optionally accept instance of createForm

[larrybotha]

Allow users to create an instance of createForm, and pass it to Form as a prop. This will ensure the user has access to all of the form methods and stores without having to bind to Form slot props.

e.g.

// Form.svelte
<script>
	// ...
	export let context = createForm(
		//...
	)

	// ...
</script>

Notes

• onSubmit in Form would need to be assigned a default value, as use of context would make the prop redundant
  • how do we elegantly handle the conditionally required onSubmit?

Todo

• ensure that all Form tests include user-defined context and default context variants

Related issues

• allows for working around top-level stores not working in <Form> does not seem to be passing slot props to parent #56

[tjinauyeung]

🎉 This issue has been resolved in version 1.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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