Suppport TaskWakeupMethWrapper.__self__ to conform asyncio _format_handle logic

[asvetlov]

BPO	38986
Nosy	@asvetlov, @1st1
PRs	bpo-38986: Make repr of C accelerated TaskWakeupMethWrapper the same as of pure Python version #17484 [3.8] bpo-38986: Make repr of C accelerated TaskWakeupMethWrapper the same as of pure Python version (GH-17484) #17493 [3.7] bpo-38986: Make repr of C accelerated TaskWakeupMethWrapper the same as of pure Python version (GH-17484) #17494

^{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 2019-12-07.11:50:58.189>
created_at = <Date 2019-12-06.13:09:22.582>
labels = ['3.7', '3.8', '3.9', 'expert-asyncio']
title = 'Suppport TaskWakeupMethWrapper.__self__ to conform asyncio _format_handle logic'
updated_at = <Date 2019-12-07.11:50:58.188>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2019-12-07.11:50:58.188>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2019-12-07.11:50:58.189>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2019-12-06.13:09:22.582>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 38986
keywords = ['patch']
message_count = 2.0
messages = ['357913', '357915']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['17484', '17493', '17494']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38986'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[asvetlov]

_format_handle() behaves differently if handle._callback.__self__ is asyncio.Task instance.

To follow this logic TaskWakeupMethWrapper from _asynciomodule.c should support the corresponding member.

The fix is very desired for analyzing slow callbacks, without it the output doesn't point on slow coroutine but mentions <TaskWakeupMethWrapper at 0x...> only.

See also bpo-38608

[asvetlov]

For the note: TaskStepMethWrapper has the same fix already, TaskWakeupMethWrapper was accidentally missed.