[http-client] combine generated consecutive path literals

[SentryMan]

Now will generate clients like this

@Client
public interface ApiClient {
  @Get("/consecutive/paths/generate")
  String consecutive();
}

  @Override
  public String consecutive(String accept) {
    return client.request()
      .path("consecutive/paths/generate")
      .GET()
      .asPlainString().body();
  }