The purpose of this transaction is that a user can transfer his territory to another user, but the premise is that there are no files stored in this territory and the status is Active.
/// Transfers a territory from one user to another.
///
/// This transaction allows a user to transfer their territory to another user.
/// The territory must be empty (i.e., no files stored in it) and its status must be `Active`
/// for the transfer to be successful.
///
/// # Arguments
///
/// * `territory_name` - A reference to a string slice that holds the name of the territory to be transferred.
/// * `receiver` - A reference to a string slice that holds the account identifier of the receiving user.
///
/// # Returns
///
/// This function returns a `Result` which is:
/// * `Ok(TxHash)` - The transaction hash of the successful territory transfer.
/// * `Err(Box<dyn std::error::Error>)` - An error if the transaction fails.
///
pub async fn territory_grants(
&self,
territory_name: &str,
receiver: &str,
) -> Result<TxHash, Box<dyn std::error::Error>>
