telegrambots-spring-boot-starter: add support for TelegramLongPollingCommandBot

[centralhardware]

automatic register BotCommand in TelegramLongPollingCommandBot

it's allow to use ideomatic spring DI in BotCommand classes

[UnAfraid]

I've nothing against the idea, but the implementation kinda forces you to use the long pooling mechanism, while this is implemented in spring extension which is by nature is a web serving framework. I just think it makes no sense the way command bot implementation works to be directly integrated that way.