Todo

• Add mini DI to config initialization.

• Add more tests.

• Complete documentation in code (classes and methods).

• Add validation to command(), step(), callback() at initialization.

• Add ConfigExpression for all interfaces in TelegramBotConfig (at least for Spring).

• Add ability to specify action ('typing...', etc.).

• Synchronize or drop parallel events in one chat.

• Figure out how to send messages longer than 4096 characters.

• Figure out how to implement internationalization.

• Create custom @ConditionalOnMissingBean for source-jpa io.github.dehuckakpyt.telegrambot.config.