Add rendering and handling for various disabled input states in CFv2.

app/src/main/java/org/thoughtcrime/securesms/util/ViewModelFactory.kt

@@ -1,5 +1,8 @@
 package org.thoughtcrime.securesms.util
 
+import androidx.annotation.MainThread
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 
@@ -23,3 +26,12 @@ class ViewModelFactory<MODEL : ViewModel>(private val create: () -> MODEL) : Vie
     }
   }
 }
+
+@MainThread
+inline fun <reified VM : ViewModel> Fragment.viewModel(
+  noinline create: () -> VM
+): Lazy<VM> {
+  return viewModels(
+    factoryProducer = ViewModelFactory.factoryProducer(create)
+  )
+}