Add ability to set meta in page components

[fzaninotto]

• Add support for meta in <Create>
• Add support for meta in <Show>
• Add support for meta in <List>
• Add support for meta in <Edit>
• Add documentation
• Add tests

import { Edit, SimpleForm } from 'react-admin';

const PostEdit = () => (
    <Edit mutationOptions={{ meta: { foo: 'bar' } }}>
        <SimpleForm>
            ...
        </SimpleForm>
    </Edit>
);

Closes #7357
Refs #7785, #7665

[djhi]

Nice! There are a few warnings left and I think we should also support the meta prop on the delete buttons

[fzaninotto]

The Delete button can be in another PR

[gengue]

This is great 🥇
It would be really useful to have this meta prop in Reference inputs as well, most of the time we just need id and name to be rendered in a Select or Autocomplete, but the dataProvider will fetch the default list with this prop we could have more control in forms