Refactoring: Replace ClapMediaOrientation with ClapImageRatio

[jbilcke-hf]

Context

Our current ClapMediaOrientation is a bit limited, to portrait, landscape and square

It initially made sense when we only had either landscape or portrait, but today with square it becomes confusing,
especially since a more common word for this kind of stuff is "image ratio".

Solution

• Rename ClapMediaOrientation to ClapImageRatio
• replace il all the code base
• add a migration code for older projects

[jbilcke-hf]

done