Store current task on the loop in asyncio

[kumaraditya303]

Currently the current task of a loop in stored in a global dict mapping loops to their corresponding current tasks.

cpython/Modules/_asynciomodule.c

Lines 100 to 104 in 8d16919

	/* Dictionary containing tasks that are currently active in
	all running event loops. {EventLoop: Task} */
	PyObject *current_tasks;
	/* WeakSet containing scheduled 3rd party tasks which don't

However this will perform poorly in free threading build as such I propose to store it in on the loop itself.

See https://discuss.python.org/t/store-current-task-on-the-loop/75926

Linked PRs

• gh-128415: store current task on loop  #128416