Make interrupt module more standard.

- Move typelevel interrupts to a special-purpose mod: `embassy_xx::interrupt::typelevel`.
- Reexport the PAC interrupt enum in `embassy_xx::interrupt`.

This has a few advantages:
- The `embassy_xx::interrupt` module is now more "standard".
  - It works with `cortex-m` functions for manipulating interrupts, for example.
  - It works with RTIC.
- the interrupt enum allows holding value that can be "any interrupt at runtime", this can't be done with typelevel irqs.
- When "const-generics on enums" is stable, we can remove the typelevel interrupts without disruptive changes to `embassy_xx::interrupt`.

embassy-nrf/src/chips/nrf52810.rs

@@ -234,36 +234,32 @@ impl_saadc_input!(P0_29, ANALOG_INPUT5);
 impl_saadc_input!(P0_30, ANALOG_INPUT6);
 impl_saadc_input!(P0_31, ANALOG_INPUT7);
 
-pub mod irqs {
-    use embassy_cortex_m::interrupt::_export::declare;
-
-    use crate::pac::Interrupt as InterruptEnum;
-
-    declare!(POWER_CLOCK);
-    declare!(RADIO);
-    declare!(UARTE0_UART0);
-    declare!(TWIM0_TWIS0_TWI0);
-    declare!(SPIM0_SPIS0_SPI0);
-    declare!(GPIOTE);
-    declare!(SAADC);
-    declare!(TIMER0);
-    declare!(TIMER1);
-    declare!(TIMER2);
-    declare!(RTC0);
-    declare!(TEMP);
-    declare!(RNG);
-    declare!(ECB);
-    declare!(CCM_AAR);
-    declare!(WDT);
-    declare!(RTC1);
-    declare!(QDEC);
-    declare!(COMP);
-    declare!(SWI0_EGU0);
-    declare!(SWI1_EGU1);
-    declare!(SWI2);
-    declare!(SWI3);
-    declare!(SWI4);
-    declare!(SWI5);
-    declare!(PWM0);
-    declare!(PDM);
-}
+embassy_cortex_m::interrupt_mod!(
+    POWER_CLOCK,
+    RADIO,
+    UARTE0_UART0,
+    TWIM0_TWIS0_TWI0,
+    SPIM0_SPIS0_SPI0,
+    GPIOTE,
+    SAADC,
+    TIMER0,
+    TIMER1,
+    TIMER2,
+    RTC0,
+    TEMP,
+    RNG,
+    ECB,
+    CCM_AAR,
+    WDT,
+    RTC1,
+    QDEC,
+    COMP,
+    SWI0_EGU0,
+    SWI1_EGU1,
+    SWI2,
+    SWI3,
+    SWI4,
+    SWI5,
+    PWM0,
+    PDM,
+);