Parses the render options that would be used to submit the given form, but does not render.
Given a form element:
<form action="/foo" method="post" up-target=".content">
...
</form>
We can parse the form's render options like this:
let form = document.querySelector('form')
let options = up.form.submitOptions(form)
// result: { url: '/foo', method: 'POST', target: '.content', ... }
The parsed submit options.
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