Ability to change the increase/decrease (+/-) buttons in the Form SpinButton component

[bencelaszlo]

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

I can't find an option to change the +/- characters in the Form SpinButton component's buttons:

Describe the solution you'd like

I would like to have a slot to customize the component. Change the + to > or the - to DEC or something like that.

Describe alternatives you've considered

The current solution is to use third-party components, which is not optimal, because the Bootstrap-Vue SpinButton only lacks these options to swap these under-maintained third party components.

Additional context

[tmorehouse]

Currently these are bootstrap icons that are rendered (not characters) inside buttons, but it should be possible to add slots for the content in a future release.

[bencelaszlo]

Currently these are bootstrap icons that are rendered (not characters) inside buttons, but it should be possible to add slots for the content in a future release.

I would be more than happy with this.