[SERVICES-2532] Expose extra fields on pair model

[mad2sm0key]

Reasoning

• exposing the farm address and staking proxy address on the Pair model would reduce the number of needed queries on the Create position page

Proposed Changes

• expose farmAddress and stakingProxyAddress fields on the Pair model

How to test

query {
  filteredPairs(
    filters: {}
    pagination: { first: 100 }
    sorting: { sortField: TVL, sortOrder: DESC }
  ) {
    edges {
      cursor
      node {
        address
        firstToken {
          name
          identifier
        }
        secondToken {
          name
          identifier
        }
        farmAddress
        stakingProxyAddress
      }
    }
    pageInfo {
      startCursor
      endCursor
    }
    pageData {
      count
      limit
      offset
    }
  }
}

[cfaur09]

tested 🟢