feat(MAJOR): removed the need for dyn_id

This is a very very very big update for UX! Ewwii finally has support
for automatically assigning `dyn_id`.

This was actually not as hard as I thought! I just had to mutate the
widget AST and inject a `dyn_id` in based on its parent.

It works soooo well and the burden on the user just reduced sooo much!

tools/generate-rhai-docs/src/main.rs

@@ -1,6 +1,6 @@
-use rhai_impl::providers;
 use rhai::{Engine, module_resolvers::StaticModuleResolver};
 use rhai_autodocs::{export::options, generate::mdbook};
+use rhai_impl::providers;
 use std::{env, fs, path::Path};
 
 fn generate_docs(