Add a return value to lib2to3.refactor.refactor_file and refactor_dir

[martindemello]

BPO	35282
Nosy	@benjaminp, @zware, @martindemello
PRs	bpo-35282: Add a return value to lib2to3.refactor_file and refactor_dir #10618
Superseder	bpo-45544: Close 2to3 issues and list them here

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-10-20.23:07:11.780>
created_at = <Date 2018-11-20.19:34:11.109>
labels = ['type-feature', 'expert-2to3', '3.9']
title = 'Add a return value to lib2to3.refactor.refactor_file and refactor_dir'
updated_at = <Date 2021-10-20.23:07:11.779>
user = 'https://github.com/martindemello'

bugs.python.org fields:

activity = <Date 2021-10-20.23:07:11.779>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.23:07:11.780>
closer = 'iritkatriel'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2018-11-20.19:34:11.109>
creator = 'martindemello'
dependencies = []
files = []
hgrepos = []
issue_num = 35282
keywords = ['patch']
message_count = 1.0
messages = ['330149']
nosy_count = 3.0
nosy_names = ['benjamin.peterson', 'zach.ware', 'martindemello']
pr_nums = ['10618']
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = '45544'
type = 'enhancement'
url = 'https://bugs.python.org/issue35282'
versions = ['Python 3.9']

[martindemello]

It would be useful for lib2to3.refactor to return which files were actually changed. Right now that information is logged but not returned.