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

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

src/main.rs

@@ -4,8 +4,6 @@ pub mod cli;
 mod cli_generate;
 
 fn main() -> eyre::Result<()> {
-    //
-
     color_eyre::install().unwrap();
 
     let args = std::env::args();