Add CLI import and export commands (#484)

crates/yaak/src/error.rs

@@ -4,6 +4,18 @@ use thiserror::Error;
 pub enum Error {
     #[error(transparent)]
     Send(#[from] crate::send::SendHttpRequestError),
+
+    #[error(transparent)]
+    Model(#[from] yaak_models::error::Error),
+
+    #[error(transparent)]
+    Plugin(#[from] yaak_plugins::error::Error),
+
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("JSON error: {0}")]
+    Json(#[from] serde_json::Error),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;