feat: Adds the ability to sort conversations (#6853)

* Add sort filter

* Change UI

* Change filter

* Complete sort by filters

* Style fixes

* Fix default sort

* Update app/javascript/dashboard/components/widgets/conversation/ConversationBasicFilter.vue

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

* Update app/javascript/dashboard/components/widgets/conversation/ConversationBasicFilter.vue

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

* Update app/javascript/dashboard/components/ChatList.vue

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

* Added translation

* Added review fixes

* Add more updates

* Code cleanups

* Update last_activity_at on message received event

* Cleans up the design for chatlist and icons

* Fix sort

* Remove inline styles

* Add tag along with the title

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

app/javascript/shared/assets/stylesheets/colors.scss

@@ -103,4 +103,7 @@
   --color-whatsapp-brand: #25d366;
   --color-sms-twilio: #f42f46;
   --color-cloud-generic: #18b7b0;
+
+  // Tech-debt
+  --color-medium-gray: #8492a6;
 }