v2.0.0

- alarm_callback_t : time.h
- alarm_id_t : time.h
- async_at_time_worker_t : async_context.h
- async_context_type_t : async_context.h
- async_when_pending_worker_t : async_context.h
- exception_handler_t : exception.h
- gpio_irq_callback_t : gpio.h
- hardware_alarm_callback_t : timer.h
- i2c_slave_event_t : i2c_slave.h
- i2c_slave_handler_t : i2c_slave.h
- irq_handler_t : irq.h
- mutex_t : mutex.h
- pheap_comparator : pheap.h
- pico_sha256_state_t : sha256.h
- pio_interrupt_source_t : pio.h
- repeating_timer_callback_t : time.h
- resus_callback_t : clocks.h
- rtc_callback_t : rtc.h
- spi_inst_t : spi.h