Post message after all copy buttons added

[ohrely]

Describe the problem/need and solution

Context
We are logging copy events in documentation built with sphinx. We can clumsily capture these events by listening to all click events on a parent node, but we would prefer to add an event listener to each copybutton.

Problem / Idea
Because copy buttons are injected into the page at a non-deterministic time, there is currently no way for us to know when sphinx-copybutton has finished adding all buttons to the document.

Solution
Two potential solutions we've thought of:

1. Trigger a custom event when all buttons are added
2. Post a message to window when all buttons are added

Benefit
This would simplify the task of monitoring copybutton click events for analytics and other purposes.

Guide for implementation

We think the event or message would be triggered at the end of this for loop.

Tasks and updates

No response

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[ohrely]

(We is @fasiha and myself)

If this change would be welcome, we would be happy to take a stab at implementing.

[choldgraf]

This seems reasonable to me as long as the implementation isn't too complicated to maintain👍