Add support for Bot API 6.4 (Topics in Forum Supergroups) #766
Description
Hello!
Telegram has released a new version of the Bot API 6.4, which adds support for Topics in supergroup forums. To fully integrate with this innovation in the bot, I would really like to have the following methods and parameters related to topics:
Create and manage topics (New Forum Topic, Edit Forum Topic, etc.).
Get a list of topics and work with messages inside topics.
Events (Updates) related to topics so that the bot can respond correctly to changes (for example, a new message in the topic, closing the topic, etc.).
Any additional fields in the SendMessage, forwardMessage, etc. methods that are necessary for working with themes.
According to the official Telegram Bot API documentation (v6.4), new objects and fields related to topics have been added. It would be great to have them in the go-telegram-bot-api to simplify the development and support of forums in bots.