This adds the UI plus all necessary models and signal handling to render
discord import progress in the desktop application.
It also introduces message handling for discord chat message types.
Requires status-im/status-go#2826 to function
Co-authored with @caybro
- `chatType` added to `Constants` to group chat type related values
- `messageContentType` added to `Constants` to group message content type related
values
- `MessageStore` maintained per message list now
- added new `ChatContentView` component used to display chat/channel content
- components updated to display messages from the new backend
- `StatusChatToolBar` appropriately updated
- mute/unmute feature added to chat/channel list as well as to `StatusChatToolBar`
Moved Message component & dependencies to shared
for usage import shared.views.chat 1.0 and accordingly
import shared.controls/panels.chat 1.0
Closes#3927
Pascal Precht
Igor Sirotin
Jonathan Rainville
Sale Djenic
Alexandra Betouni