Add asyncio.current_task() and asyncio.all_tasks() funcitons

[asvetlov]

BPO	32250
Nosy	@asvetlov, @1st1
PRs	bpo-32250: Implement loop.current_task() and loop.all_tasks() #4766 bpo-32250: Implement asyncio.current_task() and asyncio.all_tasks() #4799

^{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 2017-12-16.19:59:57.583>
created_at = <Date 2017-12-07.23:04:02.054>
labels = ['3.7', 'type-feature', 'library', 'expert-asyncio']
title = 'Add asyncio.current_task() and asyncio.all_tasks() funcitons'
updated_at = <Date 2017-12-16.19:59:57.582>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2017-12-16.19:59:57.582>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-16.19:59:57.583>
closer = 'asvetlov'
components = ['Library (Lib)', 'asyncio']
creation = <Date 2017-12-07.23:04:02.054>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 32250
keywords = ['patch']
message_count = 3.0
messages = ['307826', '308056', '308480']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['4766', '4799']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32250'
versions = ['Python 3.7']

[asvetlov]

Existing Task.current_task() and Task.all_tasks() class methods are not overridable by custom event loop implementation.

The proposal is adding new optional loop methods and using them by existing task methods.

[asvetlov]

In #4766 discussion we decided to use module level functions instead of loop methods.

[asvetlov]

New changeset 44d1a59 by Andrew Svetlov in branch 'master':
bpo-32250: Implement asyncio.current_task() and asyncio.all_tasks() (bpo-4799)
44d1a59