Rework Zone Analytics API to use GraphQL API

[xperseguers]

When using Bearer Authentication, the statistics module fails to show graphs. The API calls fails with an error:

Zone Analytics API is sunset and replaced by GraphQL API

[xperseguers]

https://developers.cloudflare.com/analytics/migration-guides/zone-analytics

[xperseguers]

Example query:

query {
  viewer {
    zones(filter:{zoneTag:"<REDACTED>"}) {
      httpRequests1dGroups(
        orderBy: [date_ASC]
        limit: 1000
        filter: { date_gt: "2021-05-01" }
      ) {
        date: dimensions {
          date
        }
        sum {
          cachedBytes
          bytes
        }
      }
    }
  }
}

Possible library to use (if not willing to write in raw cURL): https://github.com/mghoneimy/php-graphql-client