Added support for topics in Bot API 6.3

[KatantDev]

Description

https://core.telegram.org/bots/api-changelog#november-5-2022
Added support for topics in 2.x

Type of change

• New feature (non-breaking change that adds functionality)

How has this been tested?

--

Test Configuration

• Operating system: Windows 10 x64
• Python version: Python 3.10

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works as expected
• New and existing unit tests pass locally with my changes
• My changes generate no new warnings or errors
• My changes are compatible with minimum requirements of the project
• I have made corresponding changes to the documentation

[Desiders]

You forgot to add the is_forum attribute to the class Chat.