Add dataclasses.is_dataclass(obj)

BPO	32499
Nosy	@ericvsmith
PRs	bpo-32499: Add dataclasses.is_dataclass(obj), which returns True if obj is a dataclass or an instance of one. #5113

^{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/ericvsmith'
closed_at = <Date 2018-01-06.17:44:16.056>
created_at = <Date 2018-01-05.20:50:22.771>
labels = ['3.7', 'type-feature', 'library']
title = 'Add dataclasses.is_dataclass(obj)'
updated_at = <Date 2018-01-06.17:44:16.055>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2018-01-06.17:44:16.055>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2018-01-06.17:44:16.056>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2018-01-05.20:50:22.771>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 32499
keywords = ['patch']
message_count = 3.0
messages = ['309523', '309553', '309561']
nosy_count = 1.0
nosy_names = ['eric.smith']
pr_nums = ['5113']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32499'
versions = ['Python 3.7']