Re-organize the wasm examples (#231)

* Move the whisper example.

* More renaming.

* Add llama2 as a new wasm example.

* Live generation.

* More of the llama wasm example.

* Formatting.

candle-wasm-examples/llama2-c/src/bin/app.rs

@@ -0,0 +1,4 @@
+fn main() {
+    wasm_logger::init(wasm_logger::Config::new(log::Level::Trace));
+    yew::Renderer::<candle_wasm_example_llama2::App>::new().render();
+}

candle-wasm-examples/llama2-c/src/bin/worker.rs

@@ -0,0 +1,4 @@
+use yew_agent::PublicWorker;
+fn main() {
+    candle_wasm_example_llama2::Worker::register();
+}