[RFR] chore(apollo): migrate to apollo 3

[Oupsla]

Hello folks 👋

Apollo packages are now deprecated and everything has been centralized to single package on npm (@apollo/client)

Little note : IntrospectionFragmentMatcher has been removed totally (link) , so I have just removed it (tested with my project without errors, so I think the issue linked in the code is gone with apollo3)

[djhi]

Thanks! We'll have to migrate the json-graphql-server package as well though

[Oupsla]

Thanks! We'll have to migrate the json-graphql-server package as well though

Do I need to do something else in this PR ?

[djhi]

I don't think so but we won't merge before being able to test it and that means we'll have to migrate json-graphql-server first.

[julien1619]

Hello! I've started working on the same thing a week ago after seeing #6312 but didn't see your PR until today.

You can remove graphql-tag too and use import { gql } from "@apollo/client" instead as I did here: https://github.com/marmelab/react-admin/pull/6347/files

Like I said in the other PR, before being merged it would need an upgrade of ra-data-graphql-simple.
I tried to upgrade it too, but it mainly depends on a dead fork of a dead project (last commit 2018), depending on an outdated version of graphql (0.11).

[julien1619]

Is there anything I can do to help here?

[larsivi]

I am starting to have other dependencies that also rely on Apollo 3, supporting both in the application is not easy. I am also willing to help here if necessary to expedite this issue.

[Oupsla]

Coming back from vacation, will have a look at it asap

[djhi]

Thanks, I opened a new PR fixing both packages. We also upgraded json-graphql-server.