Add ColumnList Test

[Agaba-derrick]

Key highlights of this PR:

• Testing Parcelable Methods: The tests ensure the correct serialization and deserialization of ColumnList objects using the writeToParcel and readFromParcel methods.
• Real Data, No Mocks: Following our testing approach, the tests use real Column objects instead of mock data, ensuring an accurate simulation of real-world usage.
• Validation of Edge Cases: Tests cover edge cases such as empty column lists and null inputs to verify that the class handles these scenarios gracefully.

this fixes issue #513 and #507