refactor: Adopt asyncio.TaskGroup for structured concurrency (#643) #65

Job	Run time
Docstrings checks / Docstrings checks	20s
Code checks / Spell check	5s
Code checks / Actions lint check	33s
Doc checks / Doc checks / Docs check	1m 20s
Code checks / Type check / Type check (3.11)	10s
Code checks / Lint check / Lint check (3.14)	10s
Code checks / Lint check / Lint check (3.13)	8s
Code checks / Type check / Type check (3.12)	15s
Code checks / Lint check / Lint check (3.11)	17s
Code checks / Type check / Type check (3.13)	9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	36s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	37s
Code checks / Type check / Type check (3.14)	17s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	52s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	37s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	57s
Code checks / Lint check / Lint check (3.12)	12s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 23s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	43s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	58s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.14)	58s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.11)	1m 7s
Doc release	0s
Release prepare	21s
Changelog update / bump_and_update_changelog	11s
PyPI publish	26s
Doc release post publish / Doc release	1m 29s
	15m 11s

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