feat: encode PID

[cocoa-xu]

Encode PID as Bytes objects

[josevalim]

Thank you! ❤️ @jonatanklosko do we want to convert it to bytes or actually wrap it around a new Python object?

[jonatanklosko]

Yes, we discussed this offline :) I would create the pythonx python module as part of init here:

pythonx/c_src/pythonx.cpp

Lines 425 to 428 in 6db2d79

	sys.stdout = Stdout(0)
	sys.stderr = Stdout(1)
	sys.stdin = Stdin()
	)";

It would be something like this:

import types
import sys

pythonx = types.ModuleType("pythonx")

class PID:
  def __init__(self, bytes):
    self.bytes = bytes

pythonx.PID = PID

sys.modules["pythonx"] = pythonx

Then in the NIF we can call PyImport_AddModule("pythonx"), get the PID attribute and call it with the bytes as argument.

Then in another PR we would add send as another function in that module.

@cocoa-xu if there are any issues with this approach let me know!