feat(api): Add interrupts for core 1 & pycardium

epicardium/api/common.h

epicardium/api/interrupt-receiver.c

epicardium/api/interrupt-sender.c

epicardium/api/interrupt-sender.h

epicardium/epicardium.h

epicardium/main.c

epicardium/meson.build

epicardium/modules/serial.c

pycardium/main.c

pycardium/meson.build

pycardium/modules/interrupt.c

pycardium/modules/qstrdefs.h

pycardium/mpconfigport.h

pycardium/mphalport.c