solana: add FromStr for cluster

crates/by-chain/icepick-solana/src/lib.rs

@@ -62,6 +62,19 @@ pub enum Cluster {
     Mainnet,
 }
 
+impl std::str::FromStr for Cluster {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "devnet" => Ok(Self::Devnet),
+            "testnet" => Ok(Self::Testnet),
+            "mainnet" => Ok(Self::Mainnet),
+            _ => Err("Invalid value"),
+        }
+    }
+}
+
 impl std::fmt::Display for Cluster {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {