[Telegram] Core - Plugin provides the ability to log in via Telegram and basic code events
Plugin provides the ability to log in via Telegram and basic code events for implementing bots with XF.
By default, plugin implements two ways for authenticating: default Telegram OAuth Button and "dialog with bot" (for cases when button doesn't displayed because user lives in country with censorship (hello from Russia)).
For using Telegram as authentication provider, we need create bot.