Finish MFA v1 and refactor all tokens into separate TokenService with modified collection

backend/src/variables/token.ts

@@ -0,0 +1,11 @@
+const TOKEN_EMAIL_CONFIRMATION = 'emailConfirmation';
+const TOKEN_EMAIL_MFA = 'emailMfa';
+const TOKEN_EMAIL_ORG_INVITATION = 'organizationInvitation';
+const TOKEN_EMAIL_PASSWORD_RESET = 'passwordReset';
+
+export {
+    TOKEN_EMAIL_CONFIRMATION,
+    TOKEN_EMAIL_MFA,
+    TOKEN_EMAIL_ORG_INVITATION,
+    TOKEN_EMAIL_PASSWORD_RESET
+}