feat(plugins): add logging plugin that allows writing logs to storybook

[buehler]

This adds a new plugin "logging".
This allows getting a log interface from the context to write
logs from buttons or actions. One can see the log list with the
"quote" icon and can inspect logged messages.

As an example:

Story(
  name: 'Story/Logging',
  builder: (context) => Center(
    child: ElevatedButton(
      onPressed: () => context.logger.log('This is a test message'),
      child: const Text('Log something'),
    ),
  ),
),

[buehler]

Hey @ookami-kb
wdyt? :-)

[ookami-kb]

Yeah, LGTM. Please just update golden images (use the ones from the action run artifacts – the ones with _testImage name).

[buehler]

Alright, sorry @ookami-kb for the delay. I updated the golden images and pushed them.

Let me know if you need something :-)

[buehler]

Weird, why do they fail now?

[ookami-kb]

@buehler you can download generated images from the artifacts here: https://github.com/ookami-kb/storybook_flutter/actions/runs/8233183433?pr=131

In general, there are some minor incosistencies between different platforms, so it's better to just copy and commit the generated images from the artifacts, if they look correct.

[buehler]

@ookami-kb Wohow! :-)
Thank you for the help regarding the golden images.