Split embassy crate into embassy-executor, embassy-util.

examples/stm32l4/src/bin/usart_dma.rs

@@ -5,14 +5,14 @@
 use core::fmt::Write;
 
 use defmt::*;
-use embassy::executor::Spawner;
+use embassy_executor::executor::Spawner;
 use embassy_stm32::dma::NoDma;
 use embassy_stm32::usart::{Config, Uart};
 use embassy_stm32::Peripherals;
 use heapless::String;
 use {defmt_rtt as _, panic_probe as _};
 
-#[embassy::main]
+#[embassy_executor::main]
 async fn main(_spawner: Spawner, p: Peripherals) {
     info!("Hello World!");