feat: add network to delegation portal

[wa0x6e]

Toward https://github.com/snapshot-labs/workflow/issues/177

This PR will return the new delegationNetwork property in the Delegation Portal setting.

When the property does not exist (for old data), it will always return 1 (ethereum).

Test

This space does not have delegationNetwork set, and the hub will return 1

query Spaces {
  spaces (where: { id: "test.wa0x6e.eth"}  ){
    id
    delegationPortal {
      delegationApi
      delegationType
      delegationNetwork
      delegationContract
    }
  }
}

[ChaituVR]

tAck