Ability to provide a callback function to metabind button

Please fill out these Check-boxes

• I checked for existing similar feature requests
• I have read the docs and checked that the feature I am requesting is not already implemented
• My feature request consists of only one feature

Is your Feature Request related to a Problem or Annoyance?

Metabind buttons are great when you use them from markdown but if I want to use them from API then the fact that I can't connect them to a simple javascript callback is very annoying. Sure I can use evaluate or give them source file path, but I am already in code, it'd be much simpler to just give it a callback.

Describe the Feature you'd like

Give me a simple way to invoke callback, e.g.:

{
          type: ButtonActionType.JS_CALLBACK,
          value: () => { console.log("Hello world!")
}

Alternatives

The following types are as close as we can get:

• inlineJS
• js

Which is not ideal, especially if you want to share some context between your code and the button callback

Additional Context

No response

No files or tests are named. Start by reading the metabind button API and the existing inlineJS and js action types; confirm how API-created buttons are dispatched. Done means an API caller can provide a JavaScript callback that runs when the button is activated while preserving access to the caller's context.