feat: Svelte 5 fixes and improvements

[dummdidumm]

• pass children to zero types Svelte 5: +layout.svelte children not included in zero-effort type safety #2212
• add possibility to pass in version to svelte2tsx to differentiate transpiler targets
• add implicit children prop in Svelte 5 mode Svelte 5: Implicit children not detected correctly #2211
• add best-effort fallback typings to $props() rune
• hide deprecation warnings in generated code Svelte 5: Typescript generics in components are marked as deprecated svelte#9586