In Hawaii, the supreme court has recognized that due to the [Attorney General’s] statutorily mandated role[s] in our legal system, we cannot mechanically apply the [Hawaii] Code of Professional Responsibility to the [Attorney General’s] office. . . . In large part, this is because . . . when the client is a governmental organization . . . in some circumstances the client may be a specific [officer,] agency [or instrumentality] while in other circumstances the client is “the government as a whole.”