feat(sdk): with _opts methods

Now all opt values enter into a _opts function instead of the original.
This avoids a lot of verbosity for both None in the case opts are
unwanted, and Some() if they actually are.

They are used like so:

```rust
client.container().from("...");
client.container_opts(Some(ContainerOpts{ ... }))
```

Some from opts will be removed in a future commit/pr

crates/dagger-sdk/examples/existing-dockerfile/main.rs

@@ -7,15 +7,12 @@ fn main() -> eyre::Result<()> {
 
     let context_dir = client
         .host()
-        .directory("./examples/existing-dockerfile/app", None);
+        .directory("./examples/existing-dockerfile/app");
 
     let ref_ = client
-        .container(None)
-        .build(context_dir.id()?, None)
-        .publish(
-            format!("ttl.sh/hello-dagger-rs-{}:1h", rng.gen::<u64>()),
-            None,
-        )?;
+        .container()
+        .build(context_dir.id()?)
+        .publish(format!("ttl.sh/hello-dagger-rs-{}:1h", rng.gen::<u64>()))?;
 
     println!("published image to: {}", ref_);