[Chat] Advanced conversation flow

[TruszczynskiA]

The user should be able to send advanced messages and perform some additional actions directly from the message thread screen.

Definition of done:

• The user should be able to open the action menu by tapping on the "plus" button at the bottom.
• The user can request tokens using the action menu
• The user can send tokens by pressing the "send" button on the messages bubble.
• The user can send tokens using the action menu
• The user can send a GIF.
• The user can receive a GIF. The gif should be attached to the message and shown in the one message bubble
• The user should be able to pin a conversation thread. Pinned threads should be shown in a separate section on the conversations list screen.