Add Emoji button

[yasharya2901]

Currently, in order to insert emoji, I need to right-click on the text box and then, select Insert Emoji. Instead, please give an emoji button beside the send button so that it is clearly visible. Just like Telegram and Whatsapp.

[SilverRainZ]

I am happy to implement it : )

[SilverRainZ]

GtkEmojiChooser is only available in GTK4, let us put this feature in GTK4 version :D