feat: add unsafe-password support to cast wallet import (#6671)

* feat: add unsafe-password support to cast wallet import

* rustfmt fix

* Change env CAST_PASSWORD to CAST_UNSAFE_PASSWORD for `cast wallet import`

---------

Co-authored-by: Steve Miskovetz <steve@mbwork.lan>

crates/cast/bin/cmd/wallet/mod.rs

@@ -136,6 +136,10 @@ pub enum WalletSubcommands {
         /// (~/.foundry/keystores)
         #[arg(long, short)]
         keystore_dir: Option<String>,
+        /// Password for the JSON keystore in cleartext
+        /// This is unsafe, we recommend using the default hidden password prompt
+        #[arg(long, env = "CAST_UNSAFE_PASSWORD", value_name = "PASSWORD")]
+        unsafe_password: Option<String>,
         #[command(flatten)]
         raw_wallet_options: RawWalletOpts,
     },
@@ -282,7 +286,12 @@ impl WalletSubcommands {
                     println!("Validation failed. Address {address} did not sign this message.");
                 }
             }
-            WalletSubcommands::Import { account_name, keystore_dir, raw_wallet_options } => {
+            WalletSubcommands::Import {
+                account_name,
+                keystore_dir,
+                unsafe_password,
+                raw_wallet_options,
+            } => {
                 // Set up keystore directory
                 let dir = if let Some(path) = keystore_dir {
                     Path::new(&path).to_path_buf()
@@ -318,7 +327,12 @@ flag to set your key via:
                     })?;
 
                 let private_key = wallet.signer().to_bytes();
-                let password = rpassword::prompt_password("Enter password: ")?;
+                let password = if let Some(password) = unsafe_password {
+                    password
+                } else {
+                    // if no --unsafe-password was provided read via stdin
+                    rpassword::prompt_password("Enter password: ")?
+                };
 
                 let mut rng = thread_rng();
                 eth_keystore::encrypt_key(