Host SvelteKit SSR apps

### Before opening, please confirm:

- [X] I have checked to see if my question is addressed in the [FAQ](https://github.com/aws-amplify/amplify-hosting/blob/master/FAQ.md).
- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-hosting/issues?q=is%3Aissue+).
- [X] I have read the guide for [submitting questions](https://github.com/aws-amplify/amplify-hosting/blob/master/CONTRIBUTING.md).
- [X] I have removed any sensitive information from my code snippets and submission.

### App Id

NEW_APP

### AWS Region

us-east-1

### Amplify Hosting feature

SSR

### Is your feature request related to a problem? Please describe:

Currently, Amplify Hosting supports SSR apps only created using the Next.js framework.

### Describe how you'd like this feature to work

Support for SSR apps created using the Svelte framework.

The issue names no implementation files, tests, or entry points. Begin by comparing the existing Next.js SSR support with the requested SvelteKit hosting path; done would mean Amplify Hosting supports SSR apps created with Svelte.

Written by the indexing model from the issue text.