Add pagination for GraphQl streams

[ericboucher]

Add deep pagination for Graphql streams. Fixes #89

This also fixes #106

This requires setting up extra pagination parameters in the query like this:

query userContributedTo($username: String! $nextPageCursor_1: String) {
            user (login: $username) {
              repositoriesContributedTo (first: 100 after: $nextPageCursor_1 includeUserRepositories: true orderBy: {field: STARGAZERS, direction: DESC}) {
                pageInfo {
                  hasNextPage_1: hasNextPage
                  startCursor_1: startCursor
                  endCursor_1: endCursor
                }
                nodes {
                  node_id: id
                  name_with_owner: nameWithOwner
                  open_graph_image_url: openGraphImageUrl
                  stargazer_count: stargazerCount
                  owner {
                    node_id: id
                    login
                  }
                }
              }
            }
          }

[ericboucher]

@laurentS thanks for your comments, I used the str.split in the end. It requires users to follow the imposed schema, but it should fail early if they don't and be safer.

[sonarqubecloud]

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