Add rich based spinner

[ichard26]

Broken out of #13450. Our legacy spinners can't be used for that PR because they require that their spin() method is called manually (and thus are only really functional with the subprocess utility). Instead, let rich handle the updates in the background for us.

Can be tested manually like so:

import time
import logging.config  # this is a bug with pip's logging stack
from pip._internal.cli.spinners import open_rich_spinner
from pip._internal.utils.logging import setup_logging

setup_logging(0, no_color=False, user_log_file=None)
with open_rich_spinner("doing work"):
		time.sleep(2)
try:
		with open_rich_spinner("doing work"):
				1/0
except BaseException:
		pass
try:
		with open_rich_spinner("doing work"):
				raise KeyboardInterrupt
except BaseException:
		pass