feat: return email subscription data in User

[wa0x6e]

Toward https://github.com/snapshot-labs/workflow/issues/226

This PR returns email subscriptions data from envelop, directly from the hub, in the user(s) object.

Instead of sending an extra query to fetch user email subscription info, we can know get if from the hub with

query { 
  user(id: "0x91fd2c8d24767db4ece7069aa27832ffaf8590f3") {
    id
    name
    emailSubscription {
      status 
      subscriptions
    }
  }
}

Which will return something like

{
  "data": {
    "user": {
      "id": "0x91FD2c8d24767db4Ece7069AA27832ffaf8590f3",
      "name": "℞aphaël-Daniel de la Poubelle『⚡』",
      "emailSubscription": {
        "status": "VERIFIED",
        "subscriptions": [
          "summary"
        ]
      }
    }
  }
}

In case user is not subscribed, it will return

{
  "data": {
    "user": {
      "emailSubscription": {
        "status": "NOT_SUBSCRIBED",
        "subscriptions": []
      }
    }
  }
}

Returning email subscription data from the hub will avoid having to manage another read API on sx side.

A sister PR (snapshot-labs/snapshot.js#1081) will merge the write function inside sequencer.

TODO

• In prod, set ENVELOP_DATABASE_URL= to envelop mysql database url

[codecov]

Codecov Report

Attention: Patch coverage is 34.14634% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/graphql/operations/users.ts	0.00%	27 Missing ⚠️

Additional details and impacted files

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[bonustrack]

Can we make the config var optional so we don't enable it on testnet hub?