PLT-4167 Team Sidebar (#4569)

* PLT-4167 Team Sidebar

* Address feedback from PM

* change route from my_members to members

* bug fixes

* Updating styles for teams sidebar (#4681)

* Added PM changes

* Fix corner cases

* Addressing feedback

* use two different endpoints

* Bug fixes

* Rename model and client functions, using preferences to store last team and channel viewed

* Fix mobile notification count and closing the team sidebar

* unit test, fixed bad merge and retrieve from cached when available

* bug fixes

* use id for last channel in preferences, query optimization

* Updating multi team css (#4830)

webapp/sass/responsive/_mobile.scss

@@ -1163,6 +1163,33 @@
     .post-comments {
         padding: 9px 21px 10px 10px !important;
     }
+
+    .multi-teams {
+        .team-sidebar {
+            width: 75px;
+        }
+
+        .app__content {
+            margin-left: 0;
+        }
+
+        .sidebar--left {
+            left: 0;
+
+            &.move--right {
+                left: 75px;
+            }
+        }
+
+        .team-sidebar {
+            display: none;
+
+            &.move--right {
+                display: block;
+                @include translate3d(0, 0, 0);
+            }
+        }
+    }
 }
 
 @media screen and (max-width: 640px) {
@@ -1493,6 +1520,20 @@
 }
 
 @media screen and (max-width: 320px) {
+    .multi-teams {
+        .team-sidebar {
+            width: 65px;
+        }
+
+        .sidebar--left {
+            width: 220px;
+
+            &.move--right {
+                left: 65px;
+            }
+        }
+    }
+
     .post {
         .post__header {
             .col__name {