groups: create group and groupbar config sections (#3522)

* config: create group section

modified:   src/Compositor.cpp
modified:   src/config/ConfigManager.cpp
modified:   src/layout/DwindleLayout.cpp
modified:   src/layout/MasterLayout.cpp
modified:   src/managers/KeybindManager.cpp
modified:   src/managers/input/InputManager.cpp
modified:   src/render/decorations/CHyprGroupBarDecoration.cpp

* separate group border and groupbar colors

modified:   src/Compositor.cpp
modified:   src/config/ConfigManager.cpp
modified:   src/render/decorations/CHyprGroupBarDecoration.cpp

* add new line
modified:   config/ConfigManager.cpp