Apply fixes from StyleCI

[mechelon]

This pull request applies code style fixes from an analysis carried out by StyleCI.

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[what-the-diff]

PR Summary

• NotionParent Class Extension
  The NotionParent class is created to extend the Entity class, providing additional functionality.

• setResponseData Function
  A new function called setResponseData is introduced, which processes an input array and has a void return type.

• Superclass Method Call
  The parent::setResponseData() method is called within the setResponseData function to utilize the superclass method with the input data.

• Object Property Validation
  An if statement is added to validate the object property in response data, ensuring it is either page_id or database_id. If the validation fails, an exception with the message "Invalid Object Type" will be thrown.