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

• Improved Type Hinting for Database::getPostData()
  Fixed the type hint for the $filter variable in the Database::getPostData() function.
• Enhanced Block, Page, and Property Classes with Missing Types
  Added missing type information to the Block, Page, and Property classes, ensuring better code quality.
• Cleanup of Unnecessary 'use' Statements
  Removed unneeded 'use' statements from modified files, creating a cleaner and more maintainable codebase (excluding 'EndpointBlocksTest').