Add in blockAction handler to SlackFunction

[hello-ashleyintech]

Summary

In #1645 we introduced SlackFunction.blockSuggestion() as a handler for the block_suggestions event. While we already have a .action() handler for block_actions, we should also add in a SlackFunction.blockAction() handler to be consistent with this naming convention so folks can use either .action() or .blockAction() as they wish!

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

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[srajiang]

👋 Hello! Yay thank you for adding this functionality. I was wondering if you'd considered just reusing the Function's action method within the blockAction method, to make it super explicit that this is an alias?

Something like:

export class SlackFunction {

 action(){

 }

blockAction(){
   return this.action.apply(this, arguments);
 }

}

[srajiang]

Thoughts on locating this test and the one below it within `describe('runInteractivityHandlers', ....) on ln241?

[srajiang]

Is there any way to use the .action() function within blockAction instead of copying the code? If we can do this, it would probably reduce the likelihood of accidental drift between the two interfaces, since we expect them to be the same.

[hello-ashleyintech]

absolutely! I'll try what you suggested above and have this updated by later today! 🙌

[srajiang]

👍