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/lib.rs

@@ -0,0 +1,30 @@
+#![allow(dead_code)]
+
+pub const WITH_TIMER: bool = true;
+
+struct Timer {
+    label: &'static str,
+}
+
+impl Timer {
+    fn new(label: &'static str) -> Self {
+        if WITH_TIMER {
+            web_sys::console::time_with_label(label);
+        }
+        Self { label }
+    }
+}
+
+impl Drop for Timer {
+    fn drop(&mut self) {
+        if WITH_TIMER {
+            web_sys::console::time_end_with_label(self.label)
+        }
+    }
+}
+
+mod app;
+mod model;
+mod worker;
+pub use app::App;
+pub use worker::Worker;