[EC-528] Refactor Custom Fields into separate components (#1662)

* Refactored CustomFields to stop using RepeaterView and use BindableLayout and divided the different types on different files and added a factory to create them

* Fix formatting

src/App/Lists/ItemViewModels/CustomFields/BaseCustomFieldItemViewModel.cs

@@ -0,0 +1,49 @@
+using System.Windows.Input;
+using Bit.Core.Models.View;
+using Bit.Core.Utilities;
+using Xamarin.Forms;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public abstract class BaseCustomFieldItemViewModel : ExtendedViewModel, ICustomFieldItemViewModel
+    {
+        protected FieldView _field;
+        protected bool _isEditing;
+        private string[] _additionalFieldProperties = new string[]
+        {
+            nameof(ValueText),
+            nameof(ShowCopyButton)
+        };
+
+        public BaseCustomFieldItemViewModel(FieldView field, bool isEditing, ICommand fieldOptionsCommand)
+        {
+            _field = field;
+            _isEditing = isEditing;
+            FieldOptionsCommand = new Command(() => fieldOptionsCommand?.Execute(this));
+        }
+
+        public FieldView Field
+        {
+            get => _field;
+            set => SetProperty(ref _field, value,
+                additionalPropertyNames: new string[]
+                {
+                    nameof(ValueText),
+                    nameof(ShowCopyButton),
+                });
+        }
+
+        public bool IsEditing => _isEditing;
+
+        public virtual bool ShowCopyButton => false;
+
+        public virtual string ValueText => _field.Value;
+
+        public ICommand FieldOptionsCommand { get; }
+
+        public void TriggerFieldChanged()
+        {
+            TriggerPropertyChanged(nameof(Field), _additionalFieldProperties);
+        }
+    }
+}