Column metadata fixes

[haideralsh]

Description

Default all exported table props types to use unknown for the ColumnMetadata generic.

Changes include

• [ ] breaking change: a change that is not backwards-compatible and/or changes current functionality
• [x] fix: a non-breaking change that solves an issue
• [ ] feature: a non-breaking change that adds functionality
• [ ] chore: contains no changes affecting the library, such as documentation or test updates

Feature checklist

• [ ] Appropriate tests have been added
• [ ] Documentation has been updated
• [ ] Accessibility has been considered