Add Leptos-Use to the template

[maccesch]

Full disclosure: I'm the author of Leptos-Use but I sincerely think that it would be useful as a default dependency.

[alexichepura]

@maccesch, Thank you for the leptos-use! And thank you for the attention here :)
Yeah, i'm definitely up to add leptos-use. Lots of useful utils.

Soon I will spend more time with this project.
Thinking about use_sorted, is_*** utils, and debounces. And any other suggestion is also welcome :)