esp_hal: Add read_bytes() to Uart

[JurajSadel]

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Description

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Testing

//! This shows how to configure UART
//! You can short the TX and RX pin and see it reads what was written.
//! Additionally you can connect a logic analyzer to TX and see how the changes
//! of the configuration change the output signal.
//!
//! The following wiring is assumed:
//! - TX => GPIO4
//! - RX => GPIO5

//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3

#![no_std]
#![no_main]

use esp_backtrace as _;
use esp_hal::{
    clock::ClockControl,
    delay::Delay,
    gpio::Io,
    peripherals::Peripherals,
    prelude::*,
    system::SystemControl,
    uart::Uart,
};
use esp_println::println;

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take();
    let system = SystemControl::new(peripherals.SYSTEM);
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);

    let mut serial1 = Uart::new(peripherals.UART1, &clocks, io.pins.gpio4, io.pins.gpio5).unwrap();

    let delay = Delay::new(&clocks);

    let mut buf = &mut [0; 32];

    println!("Start");
    delay.delay_millis(10);
    loop {
        let written = serial1.write_bytes(&[5; 30]).ok().unwrap();
        // delay.delay_millis(1);
        let mut buf = &mut [0; 32];
        let read = serial1.read_bytes(buf, written);

        println!("read: {}", read);

        delay.delay_millis(500);
    }
}

Opening as a draft because I'm not sure if this is the correct approach (definitely not the best). The get_rx_fifo_count() is pretty slow for "bigger" transfers and I'm not sure how to block until all bytes are written. Other option would be to "play" a bit with delay before calling read_bytes but that seems hacky as well.

Any idea/input here would be appreciated.

closes #1567