feat: better serialization of BlockTrace

[lispc]

Describe the feature you would like

Word::from(0xff) will be serialized at "0xff".

In storage kv, it is better serialized as "0x000....000ff".

see

/// Definition of all of the data related to an account.
#[serde_as]
#[derive(PartialEq, Eq, Debug, Default, Clone, Serialize)]
pub struct Account {
    /// Address
    pub address: Address,
    /// nonce
    pub nonce: Word,
    /// Balance
    pub balance: Word,
    /// EVM Code
    pub code: Bytes,
    /// Storage
    #[serde(serialize_with = "serde_account_storage")]
    pub storage: HashMap<Word, Word>,
}

Additional context

No response