Add support for Emergency Access (#1000)

* Add support for Emergency Access

* Add migration script

* Review comments

* Ensure grantor has premium when inviting new grantees.

* Resolve review comments

* Remove two factor references

src/Core/Models/Mail/EmergencyAccessAcceptedViewModel.cs

@@ -0,0 +1,7 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessAcceptedViewModel : BaseMailModel
+    {
+        public string GranteeEmail { get; set; }
+    }
+}

src/Core/Models/Mail/EmergencyAccessApprovedViewModel.cs

@@ -0,0 +1,7 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessApprovedViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+    }
+}

src/Core/Models/Mail/EmergencyAccessConfirmedViewModel.cs

@@ -0,0 +1,7 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessConfirmedViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+    }
+}

src/Core/Models/Mail/EmergencyAccessInvitedViewModel.cs

@@ -0,0 +1,11 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessInvitedViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+        public string Id { get; set; }
+        public string Email { get; set; }
+        public string Token { get; set; }
+        public string Url => $"{WebVaultUrl}/accept-emergency?id={Id}&name={Name}&email={Email}&token={Token}";
+    }
+}

src/Core/Models/Mail/EmergencyAccessRecoveryTimedOutViewModel.cs

@@ -0,0 +1,8 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessRecoveryTimedOutViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+        public string Action { get; set; }
+    }
+}

src/Core/Models/Mail/EmergencyAccessRecoveryViewModel.cs

@@ -0,0 +1,9 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessRecoveryViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+        public string Action { get; set; }
+        public int DaysLeft { get; set; }
+    }
+}

src/Core/Models/Mail/EmergencyAccessRejectedViewModel.cs

@@ -0,0 +1,7 @@
+namespace Bit.Core.Models.Mail
+{
+    public class EmergencyAccessRejectedViewModel : BaseMailModel
+    {
+        public string Name { get; set; }
+    }
+}