feat(sdk): without Some in _opts functions

Option has been removed as a wrapper around opts. This makes it much
more convenient to use

```rust
client.container_opts(Some(ContainerOpts{}))
// ->
client.container_opts(ContainerOpts{})
```

The same options are still available, either an empty object can be
passed, or a non _opts function can be used

crates/dagger-sdk/tests/mod.rs

@@ -7,12 +7,12 @@ fn test_example_container() {
     let alpine = client.container().from("alpine:3.16.2");
 
     let out = alpine
-        .exec_opts(Some(
+        .exec_opts(
             ContainerExecOptsBuilder::default()
                 .args(vec!["cat", "/etc/alpine-release"])
                 .build()
                 .unwrap(),
-        ))
+        )
         .stdout()
         .unwrap();