tRPC: change the way the generated class is registered

On 4.1.0

```java
app.mvc(new MovieService_());
```

Starting on 4.2.0

```java
app.trpc(new MovieServiceTrpc_());
```

In 4.1.0 Rest/tRPC routes are generated into a single file. In 4.2.0 there are two files one for each of them.