Add TOML schema to Dioxus.toml templates

[Max-H-0]

I've had to do some digging while trying to correctly configure the CLI, since I didn't know all the options.
I just stumbled on this TOML schema; I haven't used it a lot but the additional Tombi suggestions appear to be very useful.

Wouldn't it make sense to include the schema (as shown) in the Dioxus.toml templates by default?
#:schema https://raw.githubusercontent.com/DioxusLabs/dioxus/main/packages/cli/schema.json

I'm fairly new to the Rust/TOML ecosystem, so appologies if this is a dumb request.