GraphQL on localnet

[lmvdz]

• added --with-indexer & --with-graphql to the start command
• added a postgres install script & start which uses the default values:

      --pg-port <PG_PORT>
          Port for the Indexer Postgres DB. Default port is 5432
          
          [default: 5432]

      --pg-host <PG_HOST>
          Hostname for the Indexer Postgres DB. Default host is localhost
          
          [default: localhost]

      --pg-db-name <PG_DB_NAME>
          DB name for the Indexer Postgres DB. Default DB name is sui_indexer
          
          [default: sui_indexer]

      --pg-user <PG_USER>
          DB username for the Indexer Postgres DB. Default username is postgres
          
          [default: postgres]

      --pg-password <PG_PASSWORD>
          DB password for the Indexer Postgres DB. Default password is postgrespw
          
          [default: postgrespw]