[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/Abstractions/IUserVerificationService.cs

@@ -0,0 +1,10 @@
+using System.Threading.Tasks;
+using Bit.Core.Enums;
+
+namespace Bit.Core.Abstractions
+{
+    public interface IUserVerificationService
+    {
+        Task<bool> VerifyUser(string secret, VerificationType verificationType);
+    }
+}