feat(sdk): re-export through lib.rs

this means that you can now use dagger_sdk::connect() instead of
dagger_sdk::client::connect();

crates/dagger-sdk/src/lib.rs

@@ -1,18 +1,6 @@
-pub mod client;
-pub mod gen;
+mod client;
+mod gen;
 mod querybuilder;
 
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub use client::*;
+pub use gen::*;