CRUD component

[apedroferreira]

Implement CRUD feature as specified in #4146

https://deploy-preview-4486--mui-toolpad-docs.netlify.app/toolpad/core/react-crud/

Tests and examples will be added in separate PRs as this PR has already grown too large.

To help review, the contents of this PR are mostly:

• Relevant changes for the new feature (new components) in packages/toolpad-core.
• Documentation added in docs, many examples but with a lot of repetition between them, feel free to just mostly take a look at the new documentation page for the Crud component.
• Added orders CRUD to the playgrounds for Vite, Next.js App Router and Next.js Pages Router.
• Other than that there are very few changes.

It took a while to reach this first version but still feel free to provide any major or minor feedback!

[mui-bot]

Netlify deploy preview

https://deploy-preview-4486--mui-toolpad-docs.netlify.app/

Generated by 🚫 dangerJS against 1e21054

[bharatkashyap]

The formState calculation seems quite expensive to be made every render, here's a performance suggestion (including removing the .filter.map chain and using a single .reduce):

const createInitialValues = React.useCallback((fields, initialValues) => {
  const baseValues = fields.reduce((acc, { field, type }) => {
    if (field === 'id') return acc;
    acc[field] = type === 'boolean' ? (initialValues[field] ?? false) : initialValues[field];
    return acc;
  }, {} as Partial<OmitId<D>>);

  return {
    values: { ...baseValues, ...initialValues },
    errors: {} as Partial<Record<keyof D, string>>
  };
}, []);

const [formState, setFormState] = React.useState(() => 
  createInitialValues(fields, initialValues)
);

[apedroferreira]

But that's only the initial state value, it doesn't run every render.
I think it should be ok, .reduce might be more efficient but not as readable.

[apedroferreira]

hm, i just looked it up and looks like it might run every render...
I guess that just passing a function with the same result still using .map and .filter would only run once though, I'll do that if it sounds cool. (just added it)