Set additional X-Forwarded- Headers

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**Tell us about your request**

The proxy in front of App Runner apps should set a more complete suite of X-Forwarded- HTTP headers. Right now, it looks like only these headers are set:

- X-Forwarded-For
- X-Forwarded-Proto

Adding the following headers would allow modern containerized Rails applications to work better behind the App Runner proxy:

- X-Forwarded-Host
- X-Forwarded-Port
- X-Forwarded-Ssl

**Additional context**

When Rails doesn't have these headers, it causes problems for the CSRF protections automatically baked-in and available in Rails. See https://github.com/rails/rails/issues/22965

**Describe alternatives you've considered**

It is possible to disable the CSRF features in Rails configuration:
```
config.action_controller.forgery_protection_origin_check = false
```

But it doesn't really make sense given that the App Runner proxy already has the necessary information to make the feature work properly.