Create poll UX (#1571)

* Add poll attachment button

* Add poll creation feature flag

* Setup navigation to CreatePollScreen

* Add create/cancel actions

* Add create poll screen ui skeleton

* Add bindings in CreatePollScreen

* Add logics in CreatePollScreen

* Cleanup code

* Fix option deletion crash

* Fix conflicts

* Add create poll logic

* Add localisations

* Fix test build errors

* Fix crash

* Add UTs

* Add accessibility IDs

* Add ui tests

* Add 240 char limit

* Fix addOption hide behavior

* Add maxNumberOfOptions

* Cleanup code

* Move delete workaround in the view model

* Use compound delete icon

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ElementX/Resources/Assets.xcassets/images/timeline/timeline-poll.imageset/Contents.json

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   "info" : {
     "author" : "xcode",
     "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
   }
 }