Return all sendMessage response objects in referenced array variable

[noplanman]

?	!
Type	improvement
BC Break	no
Fixed issues	#923 #1062

Summary

When sending long messages with Request::sendMessage(...) all response objects are now returned in an extra parameter which is passed by reference:

Request::sendMessage($data, $extras);
// `$extras['responses']` lists all `ServerRequest` response objects for split message sending

@Abduvokhid I know it's been a long time, but what do you think of this solution?
@jacklul Would appreciate any feedback on this, thanks 🙏

[Abduvokhid]

@noplanman looks good.

But as you commented markdown can be broken.

[noplanman]

@Abduvokhid Yes, not sure how to fix that to make it bullet-proof.
I've added the ability to pass options to the sendMessage method, which gives the user a bit more freedom.

Best would be to handle special cases manually though.