Add support for react-admin v5

[fzaninotto]

• [x] Upgrade dependencies
• [x] Make it compile
• [x] Make the tests pass
• [x] use the latest react-admin features

Closes #569

[fzaninotto]

I'm blocked.

For a reason I don't understand, the jest tests fail at reading the QueryClient from the QueryClientProvider.

I've verified that:

• there is only one version of @tanstack/react-query and the related core library in the project
• we no longer have any dependency on react-query in the code
• there is only one version of react and react-dom
• the tests still fail if I force the resolution of @tanstack/react-query to the very same version that is in react-admin (5.8.4)
• the tests still fail if I extract the new QueryClient() out of the test function
• the problem still occurs with a more recent yarn version (4.0.2)

If someone wants to give it a try, be my guest.

That being said, the storybook runs the test admin with greetings, so we're probably close.

[fzaninotto]

Great! Can someone with NPM credentials trigger the publication of the package?