Fix error: No exports for svelte in package.json

[pratham2609]

Fix no exports condition warning Using the svelte field in package.json to point at .svelte source files is deprecated and you must use a svelte [export condition](https://nodejs.org/api/packages.html#conditional-exports). vite-plugin-svelte 3 still resolves it as a fallback, but in a future major release this is going to be removed and without exports condition resolving the library is going to fail.