Add defaultOpen prop to Collapse for initial open state control.

[AdeboyeDN]

Changes:

• Added defaultOpen prop to CollapseProps type with default value of false
• Added new DefaultOpen story to demonstrate the functionality
• Added tests to verify defaultOpen behavior and its interaction with the open prop

This PR adds the suggested behaviour of collapse, as proposed by @itaiperi, and it closes the issue #471

Example usage:

<Collapse defaultOpen>
  <Collapse.Title>I start open</Collapse.Title>
  <Collapse.Content>Visible by default</Collapse.Content>
</Collapse>

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[AdeboyeDN]

@benjitrosch Want to take a look?