koba_wasi_sdk constants

The koba_wasi_sdk crate exposes capability and property IDs under caps:

#![allow(unused)]
fn main() {
pub mod caps {
    pub const LAYOUT: u16 = 1;
    pub const FILL: u16 = 2;
    pub const POINTER_HANDLER: u16 = 3;
    pub const VIEWPORT: u16 = 8;
    // ...
}
}

Source: koba_wasi_sdk/src/lib.rs.