Upgrade to Svelte 4

[josdejong]

Fix #296

• Upgraded to Svelte 4 providing improved TypeScript types.
• Dropped re-exporting types and utility functions from immutable-json-patch and svelte.
• Dropped deprecated types FontAwesomeIcon (use IconDefinition instead), DropdownButtonItem, MenuButtonItem, MenuSeparatorItem, MenuSpaceItem, and typeguard isMenuSpaceItem.
• The vanilla-package does not embed types of dependencies anymore and instead, imports the dependencies and use the types from there.

[josdejong]

Published now in v0.18.0