Feat : Maximize-Minimize in chatheader

[Sumitwarrior7]

Brief Title

In chatheader, now when user clicks on maximize button, the screen will get maximized and user will see the minimize button on which when user will click, screen will again get minimize and maximize-button will then appear. Such that for minimizing screen we don't need to click on 3 dots button

Fixes #429

Video/Screenshots

Screencast from 26-01-24 08:51:27 PM IST.webm

[Sumitwarrior7]

If any changes required @abhinavkrin Please tell me

[Spiral-Memory]

@Sumitwarrior7, looks good, good work. Just a light suggestion from my side: try using git rebase.