refactor: changed structure.

pkgr/src/types/fetch.rs

@@ -0,0 +1,10 @@
+/// Get a result from an external source
+pub trait Fetch<Q, R = Self> {
+    fn fetch(query: Q) -> R;
+}
+
+/// Try to get a result from an external source
+pub trait TryFetch<Q, R = Self> {
+    type Error;
+    fn try_fetch(query: Q) -> Result<R, Self::Error>;
+}

pkgr/src/types/mod.rs

@@ -0,0 +1 @@
+pub mod fetch;