[KeyConnector] Add support for key connector OTP (#1633)

* initial commit
- add UsesKeyConnector to UserService
- add models
- begin work on authentication

* finish auth workflow for key connector sso login
- finish api call for get user key
- start api calls for posts to key connector

* Bypass lock page if already unlocked

* Move logic to KeyConnectorService, log out if no pin or biometric is set

* Disable password reprompt when using key connector

* hide password reprompt checkbox when editing or adding cipher

* add PostUserKey and PostSetKeyConnector calls

* add ConvertMasterPasswordPage

* add functionality to RemoveMasterPasswordPage
- rename Convert to Remove

* Hide Change Master Password button if using key connector

* Add OTP verification for export component

* Update src/App/Pages/Vault/AddEditPage.xaml.cs

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

* remove toolbar item "close"

* Update src/Core/Models/Request/KeyConnectorUserKeyRequest.cs

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

* remove new line in resource string
- format warning as two labels
- set label in code behind for loading simultaneously

* implement GetAndSetKey in KeyConnectorService
- ignore EnvironmentService call

* remove unnecesary orgIdentifier

* move RemoveMasterPasswordPage call to LockPage

* add spacing to export vault page

* log out if no PIN or bio on lock page with key connector

* Delete excessive whitespace

* Delete excessive whitespace

* Change capitalisation of OTP

* add default value to models for backwards compatibility

* remove this keyword

* actually handle exceptions

* move RemoveMasterPasswordPage to TabPage using messaging service

* add minor improvements

* remove 'this.'

Co-authored-by: Hinton <oscar@oscarhinton.com>
Co-authored-by: Thomas Rittson <trittson@bitwarden.com>
Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

src/Core/Services/TokenService.cs

@@ -4,6 +4,7 @@ using Newtonsoft.Json.Linq;
 using System;
 using System.Text;
 using System.Threading.Tasks;
+using System.Linq;
 
 namespace Bit.Core.Services
 {
@@ -230,6 +231,16 @@ namespace Bit.Core.Services
             return decoded["iss"].Value<string>();
         }
 
+        public bool GetIsExternal()
+        {
+            var decoded = DecodeToken();
+            if (decoded?["amr"] == null)
+            {
+                return false;
+            }
+            return decoded["amr"].Value<JArray>().Any(t => t.Value<string>() == "external");
+        }
+
         private async Task<bool> SkipTokenStorage()
         {
             var timeout = await _storageService.GetAsync<int?>(Constants.VaultTimeoutKey);