feat: allow override the spv contract out point

[yangby-cryptape]

    /// The out point of the Bitcoin SPV contract.
    ///
    /// This parameter will override the value in the storage.
    /// If this parameter is not provided, the value in the storage will be used.
    #[arg(long, value_parser = value_parsers::OutPointValueParser)]
    pub(crate) spv_contract_out_point: Option<OutPoint>,