[FEATURE] Third state for switch icon: in progress and a function to call.

[GrzegorzDrozd]

Is your feature request related to a problem? Please describe.
I would like to have a xhr request on switch toggle - for example to star or unstar element. It would be nice to have a third state icon (for example a progress spinner) that I could display (even manually). It would be also nice to provide a function name to call or event that I can bind to.

Describe the solution you'd like

<button class="switch-icon (<empty>|active|progress)" data-bs-toggle="switch-icon" data-ontoggle="function_name_to_call_on_toggle">
  <span class="switch-icon-a">
  </span>
  <span class="switch-icon-b">
  </span>
  <span class="switch-icon-progress">
  </span>
</button>

When function name is provided then -progress icon is displayed untill that function returns true. (maybe returning false would display 4th icon ? that would be even more perfect ;)

Describe alternatives you've considered
I am not that fluent with javascript so I am trying to do a very messy workarounds to make it happen :/