feat: validator info deserialization (#403)

web3.js/src/index.js

@@ -9,6 +9,7 @@ export {PublicKey} from './publickey';
 export {SystemProgram} from './system-program';
 export {Token, TokenAmount} from './token-program';
 export {Transaction, TransactionInstruction} from './transaction';
+export {ValidatorInfo} from './validator-info';
 export {sendAndConfirmTransaction} from './util/send-and-confirm-transaction';
 export {
   sendAndConfirmRawTransaction,