feat: add rule only-csf3 #206
                
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Issue: #126
What Changed
Adds a new rule to check that stories are written in csf3 format.
Storybook 9 migration guide recommends
converting to csf3.
Checklist
Check the ones applicable to your change:
pnpm run update-allChange Type
Indicate the type of change your pull request is:
maintenancedocumentationpatchminormajor