typing: widget: Add typed widget outputs and JSON shapes. #3946

Job	Run time
Install & test - CPython 3.7 (ubuntu), codecov	57s
Lint - Spellcheck (codespell, typos)	19s
Lint - Commit text format (gitlint)	19s
Lint - Code format (black)	26s
Lint - PEP8 & more (ruff)	18s
Lint - Hotkeys & docs sync (lint-hotkeys)	16s
Lint - Docstrings & docs sync (lint-docstring)	16s
Lint - Import order (isort)	19s
Lint - Type consistency (mypy)	34s
Install & test - ${{ matrix.env.NAME }}	0s
Ensure isolated PR commits	0s
	3m 44s

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