Add support for v3 API tokens in China (#1300)

* Add support for v3 API tokens in China

* Add support for refreshing tokens in China

* Log auth requests without debug output

* Log failed requests to the Owner API

lib/tesla_api/middleware/token_auth.ex

@@ -0,0 +1,14 @@
+defmodule TeslaApi.Middleware.TokenAuth do
+  @behaviour Tesla.Middleware
+
+  @impl Tesla.Middleware
+  def call(%Tesla.Env{} = env, next, _opts) do
+    env =
+      case env.opts[:access_token] do
+        nil -> env
+        token -> Tesla.put_header(env, "Authorization", "Bearer " <> token)
+      end
+
+    Tesla.run(env, next)
+  end
+end