Emit include-read event

[sumezulike]

Describe the feature you'd like to request

Sphinx added an include-read event with 7.2.5 that is emitted after an include directive is processed.
It would be helpful to implement that for the MyST include directive too.

Describe the solution you'd like

The "include-read" event could be emitted immediately after the file is read like Sphinx does it.

Maybe adding this in MockIncludeDirective is good enough?

# Emit the "include-read" event
arg = [file_content]
self.renderer.sphinx_env.app.events.emit("include-read", path, self.renderer.sphinx_env.docname, arg)
file_content = arg[0]

Describe alternatives you've considered

No response

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