Balance updates For new chain updates

[bahbah94]

Additional Code Changes Needed Before Running cargo build --release

Before building your node with the balance import functionality, you need to make the following changes:

1. Import the ChainSpec trait in your node command file:

   // In your node/src/command.rs or similar file
   use sc_chain_spec::ChainSpec;

2. Modify your node's run command implementation to check for and import the balance file:

   // In your run function
   fn run(self) -> Result<()> {
       let runner = cli.create_runner(&cli.run)?;
       
       runner.run_node_until_exit(|config| async move {
           // Get a mutable chain spec
           let mut chain_spec = config.chain_spec.cloned_box();
           
           // Import balances from the default file location
           let balance_file = std::path::Path::new("./balances.json");
           if balance_file.exists() {
               println!("Importing balances from: {:?}", balance_file);
               if let Err(e) = chain_spec.with_balances_from_file(balance_file) {
                   println!("Failed to import balances: {}", e);
               }
           }
           
           // Continue with your normal node setup using the modified chain spec
           // ...
           
           Ok(())
       })
   }

3. Create a proper balances.json file in your project's root directory with your account balances.

4. Update your node's Cargo.toml to ensure you have the necessary dependencies:

   [dependencies]
   # Make sure these dependencies are present and up-to-date
   sc-chain-spec = { version = "4.0.0-dev", path = "../../client/chain-spec" }
   serde_json = "1.0"
   hex = "0.4"

After making these changes, you can run cargo build --release and the balance import functionality should be integrated into your node.