Add microseconds to logging.LogRecord

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-01-07.14:11:50.738>
labels = ['type-feature', 'library', '3.11']
title = 'Add microseconds to logging.LogRecord'
updated_at = <Date 2022-01-12.15:23:32.019>
user = 'https://github.com/jamescasbon'

bugs.python.org fields:

activity = <Date 2022-01-12.15:23:32.019>
actor = 'arwade'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-01-07.14:11:50.738>
creator = 'jamescasbon'
dependencies = []
files = ['50546']
hgrepos = []
issue_num = 46292
keywords = ['patch']
message_count = 2.0
messages = ['409963', '410011']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'arwade', 'jamescasbon']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46292'
versions = ['Python 3.11']