Refactor import statements for flow constants and add get_state metho…

[fifeek0]

This pull request makes minor improvements to the import statements in custom_components/tech/fan.py for better readability and consistency, and adds a new helper method for device state retrieval.

Code readability and maintainability:

• Refactored several import statements from .const to use multi-line format for improved clarity and consistency in async_setup_entry, is_on, and percentage methods. [1] [2] [3]
• Removed an unused import of PARTY_MODE_MIN_MINUTES from the _get_party_mode_duration method.

Functionality:

• Added a new get_state method to retrieve the device state based on the gear parameter.