Support High DPi for better experience in Telegram K.

[shawny43]

Is your feature request related to a problem? Please describe.
Normally every computers was in 1080p but my current screen are in 2K and doesn't fit the entire screen. Other telegram forks made it. There some bars across both side of my screen and it's such a waste of spaces then you can just do something for high DPi monitors.

Describe the solution you'd like
Have an option to enable High DPi Screen for 2k and higher screens resolutions. For high resolutions, by enabling high dpi make Telegram K be able to stretch to the entire screen and fix text and conversation to middle for better reading.

This is the conversation screen from Unigram. (I didn't capture the conversation list due to privacy concerns.)

Describe alternatives you've considered
Merge Telegram A and Telegram K together but keep some or most telegram K traits.
Reason Telegram A have already High DPi support.

Additional context
Using Telegram K for me is more easier than A version due to emplacements of each features. (Telegram A just confuse me with their controls menus and lack a bit of some features.)