add MicroPython protocols to stubs

[Josverl]

Based on the finding of io.Stream class/Protocol defined by Andy ion #781
that I think related to : https://github.com/micropython/micropython/blob/2c80d369988a84d85efe0483f9cf469ff27b70f9/py/stream.h#L69-L92

the naming convention in MicroPython's C source appears to be :

• struct _mp_stream_p_t
• struct _<protocol>_p_t

Protocols

• io.Stream

  • // Stream protocol
  • mp_stream_p_t

• Buffer ?

• mp_machine_spi_p_t esp_hosted_hal.c

• mp_machine_i2c_p_t - SoftI2C - static const mp_machine_i2c_p_t mp_machine_soft_i2c_p = {

• mp_pin_p_t

• FrameBuffer - static mp_framebuf_p_t formats[] = {

Stubs:
define in _mpt_shed , expose in the relevant modules - assuming they are consistent across boards an ports

Documentation:
these are sparsely documented , may need a separate page for it

[Josverl]

AFAIKT the io.Stream protocol does not exists in CPython