Add the UNSELECT command to imaplib

[ericvsmith]

BPO	40375
Nosy	@vstinner, @ericvsmith, @corona10
PRs	bpo-40375: Implement imaplib.IMAP4.unselect #19712

^{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 = 'https://github.com/corona10'
closed_at = <Date 2020-04-27.14:59:53.501>
created_at = <Date 2020-04-24.00:44:57.304>
labels = ['type-feature', 'library', '3.9']
title = 'Add the UNSELECT command to imaplib'
updated_at = <Date 2020-04-27.14:59:53.498>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2020-04-27.14:59:53.498>
actor = 'corona10'
assignee = 'corona10'
closed = True
closed_date = <Date 2020-04-27.14:59:53.501>
closer = 'corona10'
components = ['Library (Lib)']
creation = <Date 2020-04-24.00:44:57.304>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 40375
keywords = ['patch']
message_count = 3.0
messages = ['367165', '367427', '367428']
nosy_count = 3.0
nosy_names = ['vstinner', 'eric.smith', 'corona10']
pr_nums = ['19712']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40375'
versions = ['Python 3.9']

[ericvsmith]

RFC 3691 from 2004 adds support for the UNSELECT command as an extension capability. https://tools.ietf.org/html/rfc3691

imaplib does not support UNSELECT.

[corona10]

New changeset c5c4281 by Dong-hee Na in branch 'master':
bpo-40375: Implement imaplib.IMAP4.unselect (GH-19712)
c5c4281

[corona10]

I am now closing this issue.

Thank you Eric and Victor for the review!