Add elixir snippets

snippets/elixir/hev

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+def handle_event("{event}", %{}, socket) do
+  {:noreply, assign(socket, {assigns})}
+end

snippets/elixir/liveview

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+defmodule {Package}.{Name}Live do
+  use {Package}
+  @impl true
+
+  def mount(_params, _session, socket) do
+    {:ok, assign(socket)}
+  end
+
+  def render(assigns) do
+    ~L"""
+    """
+  end
+
+  {body}
+end

snippets/elixir/mod

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+defmodule {Module} do
+  {body}
+end