Added DSL, simplified polling logic, code cleanup

[lamba92]

Changes:

• Most of the polling logic has been replaced with coroutine code.
• Added TelegramBotUpdateBuilder DSL to build the bot
• Exposed TelegramBotApiClient's properties to allows custom extension
• Simplified TelegramBotApiClient's HttpClient defaults
• Replaced sealed classes with sealed interfaces
• Added logger and json to TelegramBotApiContext
• Removed @OptIn annotations
• Expanded star imports for code readability outside IDE
• bump library versions
• bump gradle wrapper version