#[plugin_interface]Expand description
Define a plugin interface from a trait.
Generates a #[repr(C)] vtable struct, interface hash constant,
capability bit constants, and a descriptor builder function.
§Example
ⓘ
#[plugin_interface(version = 1, buffer = PluginAllocated)]
pub trait Greeter: Send + Sync {
fn greet(&self, name: String) -> String;
#[optional(since = 2)]
fn greet_fancy(&self, name: String) -> String;
}