Added `ReactionType` data type, fixed typing

[andrey-helldar]

The following changes have been made:

• Added missing messageReaction() method to the TelegramUpdate object
• Added information about DTO types Reaction and ReactionType to the documentation
• The Reaction object now contains a collection of ReactionType objects rather than an array (added after a similar comment)
• Added ReactionType object
• In the handleChatReaction method of the WebhookHandler class, changed the typing of the $newReactions and $oldReactions parameters to Collection instead of array.

I apologize for this omission. I noticed it only now 😅

Why are all these changes all in one PR? It's simple! The code to be fixed is firmly bound to its "neighbor" and it's pointless, in my opinion, to create separate PRs that will load each other.

[andrey-helldar]

@fabio-ivona, @MarioGattolla, I've poured in improvements and fixes 🤗

[MarioGattolla]

@fabio-ivona I think the change of variable from array to collection (newReaction , oldReaction) could be a breaking change. Let me know if I'm wrong

[fabio-ivona]

@fabio-ivona I think the change of variable from array to collection (newReaction , oldReaction) could be a breaking change. Let me know if I'm wrong

confirm a BC here, @andrey-helldar could you fix?

[andrey-helldar]

@MarioGattolla, I was thinking the same thing and didn't expect the previous changes to be released so soon.

But the hope was that the fix would fly in so fast that hardly anyone would notice it :)

[andrey-helldar]

@fabio-ivona I can. Let's be more specific: you need to remove collections and return an array?

Also, I created a new data object there called ReactionType. Do I delete it too or can I make an array_map for it?