Add an option set default tab width

[gueriboutmathieu]

Hi @raphamorim and team working on Rio,

It would be very cool to add an option to set the default width of tabs, or maybe add the possibility to have tabs which take all width of the window like in NativeTab navigation mode. The main problem of TopTab is text is not wrapped correctly :

[vinoff]

This is somewhat related to this as well: https://github.com/raphamorim/rio/issues/1165 (padding between tabs).