Added GroupPinnedStatuses

• Added:
- GroupPinnedStatuses
- controllers for timeline, creation, deletion
- redux actions, reducers for creation, deletion
- timeline fetching in timelines action
- options to pin, unpin in status options popover for group admin

app/controllers/api/v1/groups/pins_controller.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class Api::V1::Groups::PinsController < Api::BaseController
+  include Authorization
+
+  before_action -> { doorkeeper_authorize! :write, :'write:groups' }
+  before_action :require_user!
+  before_action :set_group
+  before_action :set_status
+
+  respond_to :json
+
+  def create
+    GroupPinnedStatus.create!(group: @group, status: @status)
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
+  def destroy
+    pin = GroupPinnedStatus.find_by(group: @group, status: @status)
+
+    if pin
+      pin.destroy!
+    end
+
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_status
+    @status = Status.find(params[:statusId])
+  end
+
+  def set_group
+    @group = Group.find(params[:group_id])
+  end
+
+end