Introduce account Touched/Cleared/None state in CacheDB

[rakita]

Structure DbAccount added to CachedDB

#[derive(Debug, Clone)]
pub struct DbAccount {
    pub info: AccountInfo,
    /// If account is selfdestructed or newly created, storage will be cleared.
    pub account_state: AccountState,
    /// storage slots
    pub storage: BTreeMap<U256, U256>,
}

BTreeMap is used for storage as storage needs to be sorted when merkilized.

@mattsse when this is merged, you can integrate it inside foundry, CacheDB now has one structure for an account and cache is renamed to accounts so it will be easier to see where it breaks.