Add support for TODO Widget on ZT #3656

Job	Run time
Lint - Code format (black)	18s
Lint - Import order (isort)	15s
Lint - Docstrings & docs sync (lint-docstring)	15s
Lint - Hotkeys & docs sync (lint-hotkeys)	11s
Lint - Type consistency (mypy)	27s
Lint - PEP8 & more (ruff)	12s
Lint - Spellcheck (codespell, typos)	17s
Install & test - CPython 3.7 (ubuntu), codecov	54s
Lint - Commit text format (gitlint)	13s
Ensure isolated PR commits	6m 49s
Install & test - CPython 3.8 (ubuntu)	1m 7s
Install & test - CPython 3.9 (ubuntu)	50s
Install & test - CPython 3.10 (ubuntu)	55s
Install & test - CPython 3.11 (ubuntu)	50s
Install & test - PyPy 3.7 (ubuntu)	2m 31s
Install & test - PyPy 3.8 (ubuntu)	2m 40s
Install & test - PyPy 3.9 (ubuntu)	2m 16s
Install & test - PyPy 3.10 (ubuntu)	2m 20s
Install & test - CPython 3.11 (macos)	36s
	23m 56s

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