support new svelte/ssr feature

**Describe the feature**

resolve "svelte" to "svelte/ssr" when building for ssr to enable treeshaking of lifecycle event handlers

**A Usecase**
support sveltekit 


**Additional context**
https://github.com/sveltejs/rollup-plugin-svelte/pull/186 
https://github.com/sveltejs/svelte/issues/6372
https://github.com/sveltejs/svelte/pull/6416