components: Fix bindgen! with renamed interfaces (#5968)

This follows the same strategy pioneered by the `wit-bindgen` guest Rust
bindgen which keeps track of the latest name of an interface for how to
refer to an interface.

Closes #5961

crates/component-macro/tests/codegen/rename.wit

@@ -0,0 +1,14 @@
+interface red {
+  use self.green.{thing}
+
+  foo: func() -> thing
+}
+
+interface green {
+  type thing = s32
+}
+
+default world neptune {
+  import blue: self.red
+  import orange: self.green
+}