Convert remaining examples to Sybil

[joaander]

Description

Rewrite all of the existing code examples so that they are tested with Sybil.

Find them by ripgrepping for Examples:: and Example:. Replace these with .. code-block:: python as per the examples elsewhere in the code. Also add code examples to properties and classes that lack them entirely.

Motivation and context

Sybil tests the code examples to ensure that they run without errors. Many of the non-tested examples have errors.