dis.findlabels() should accept a code object

[laike9m]

BPO	40169
Nosy	@serhiy-storchaka, @laike9m
PRs	bpo-40169: Make dis.findlabels() accept a code object #19356

^{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 = None
created_at = <Date 2020-04-03.08:50:08.184>
labels = ['type-bug', 'library', '3.9']
title = '`dis.findlabels()` should accept a code object'
updated_at = <Date 2020-04-04.07:26:38.941>
user = 'https://github.com/laike9m'

bugs.python.org fields:

activity = <Date 2020-04-04.07:26:38.941>
actor = 'laike9m'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-04-03.08:50:08.184>
creator = 'laike9m'
dependencies = []
files = []
hgrepos = []
issue_num = 40169
keywords = ['patch']
message_count = 1.0
messages = ['365684']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'laike9m']
pr_nums = ['19356']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40169'
versions = ['Python 3.9']

[laike9m]

Continuing our discussion in https://bugs.python.org/issue40122.

I would like to make dis.findlabels() accept a code object just like other APIs in the dis module. Also this can be a good chance to add tests for it.