Is your feature request related to a problem? Please describe...

Somehow I need to set custom attributes to button, but all I have found is that we can pass only button-id prop.

Describe the solution you'd like

The solution is to provide button-attributes prop, that will be merged with aria-attributes provided by framework itself. BUT framework generated aria-attributes should take precedence.

Example of possible solution:

<b-tab :button-attributes="{ 'data-t-foo': 'bar' }">...</b-tab>