fix missing-exports-condition about svelte-material-ui HOT 4 CLOSED

Thanks @jerch for the PR. Let me know if the fix causes any issues. I also added the package.json export. I'll release a new version as soon as I add a note in the docs for this.

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When I migrated my SvelteKit app from version 1 to 2, I had this warning too and my app did not build anymore. I had the error :

> Using @sveltejs/adapter-node
error during build:
RollupError: Expression expected
    at getRollupEror (file:///.../website-app/node_modules/rollup/dist/es/shared/parseAst.js:375:41)
    at ParseError.initialise (file:///.../website-app/node_modules/rollup/dist/es/shared/node-entry.js:11155:28)
    at convertNode (file:///.../website-app/node_modules/rollup/dist/es/shared/node-entry.js:12895:10)
    at convertProgram (file:///.../website-app/node_modules/rollup/dist/es/shared/node-entry.js:12215:12)
    at Module.setSource (file:///.../website-app/node_modules/rollup/dist/es/shared/node-entry.js:14039:24)
    at async ModuleLoader.addModuleSource (file:///.../website-app/node_modules/rollup/dist/es/shared/node-entry.js:18697:13)

When I debug the build, this error occurs when parsing the SMUI components Card and Slider. Components I use in my app.

If I add the export like describe by @ruckc in these 2 components package.json, I still have some warning on other components, but the application build and run correctly :

"exports": {
 ".": {
   "svelte": "./dist/index.js"
 }
}

from svelte-material-ui.

The fix is here:

https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/faq.md#missing-exports-condition

This needs to be added to all package.json files. We need this now to prevent the annoying logs and in the future they will not support the old syntax anymore

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Created PR #649, which fixes this issue for the demo site.

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