CSE: support aliases for contract fields

We should add NatSpec annotations that allow to indicate that contract fields correspond to the same contract/account, e.g. /// @custom-kontrol-alias: escrowOne.oneEth, escrowTwo.oneEth,. They could then be used when CSEing contracts such as Governance:

contract Governance {
   OneEth oneEth;
   EscrowOne escrowOne;
   EscrowTwo escrowTwo;
   ...
}

contract EscrowOne {
   OneEth oneEth;
   ...
}

contract EscrowTwo {
   OneEth oneEth;
   ...
}

in order to only generate a single account for oneEth instead of three (one for each contract involved).

L’issue non indica file né test; inizia individuando il parsing di NatSpec/annotazioni personalizzate di Kontrol e il punto di ingresso di CSE per i campi dei contract. Traccia come i campi escrowOne, escrowTwo e oneEth di Governance diventano account, quindi definisci e testa il comportamento degli alias in modo che i campi annotati producano un account invece di tre.