Allow js to use pre-stored (de)serialize functions

plugins/store/src/error.rs

@@ -24,6 +24,12 @@ pub enum Error {
     /// Store already exists
     #[error("Store at \"{0}\" already exists")]
     AlreadyExists(PathBuf),
+    /// Serialize function not found
+    #[error("Serialize Function \"{0}\" not found")]
+    SerializeFunctionNotFound(String),
+    /// Deserialize function not found
+    #[error("Deserialize Function \"{0}\" not found")]
+    DeserializeFunctionNotFound(String),
     /// Some Tauri API failed
     #[error(transparent)]
     Tauri(#[from] tauri::Error),