What does this implement/fix? Explain your changes.

Creates an open method that allows to specify withAdditionalBottomSpace argument for InputBarAccessoryView's bind method. This is necessary when MessageView does not occupy full screen and there is something on the bottom (in our case banner view)

Does this close any currently open issues?

I couldn't find any

Where has this been tested?

Devices/Simulators: iPhone 15 Pro, iPhone 15 Pro simulator

iOS Version: 17

Swift Version: 5.9

MessageKit Version: main branch