feat(hardening): limits query depth

[ojongerius]

Addresses #25 This will limit the query depth to 10, see https://github.com/stems/graphql-depth-limit for more information.

Once we have types contain references to each other people could create cyclical queries like the following:

query evil {
  album(id: 42) {
    songs {
      album {
        songs {
          album {
            songs {
              album {
                songs {
                  album {
                    songs {
                      album {
                        songs {
                          album {
                            # and so on...
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

[ojongerius]

@freeCodeCamp/open-api time to review?

[Bouncey]

It is hard to review against code that doesn't exist. I understand the need for this, but we also need something is test against.

This will be more suited for when we have event types where you can possibly traverse queries like event -> attendees -> events -> attendees ...and so on.

[ojongerius]

@Bouncey this is true. Do you have any user stories open that would warrant having this in so I can link to this?

[Bouncey]

None for learn, I haven't looked at events yet though.

[ojongerius]

Can be resurrected when working on freeCodeCamp/events#8