Implement thread-related commands in pdb

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-08-17.23:48:01.888>
labels = ['library', '3.10']
title = 'Implement thread-related commands in pdb'
updated_at = <Date 2022-03-28.23:09:47.329>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2022-03-28.23:09:47.329>
actor = 'cebtenzzre'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-08-17.23:48:01.888>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 41571
keywords = []
message_count = 5.0
messages = ['375579', '375585', '375587', '375589', '376633']
nosy_count = 5.0
nosy_names = ['bar.harel', 'corona10', 'pablogsal', 'iritkatriel', 'cebtenzzre']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue41571'
versions = ['Python 3.10']