private: adds tokens controller

adds private api
adds AuthTokenDto and AuthTokenWithSecretDto
adds necessary methods in the users service
adds RandomnessError

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/api/private/private-api.module.ts

@@ -0,0 +1,15 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Module } from '@nestjs/common';
+import { UsersModule } from '../../users/users.module';
+import { TokensController } from './tokens/tokens.controller';
+
+@Module({
+  imports: [UsersModule],
+  controllers: [TokensController],
+})
+export class PrivateApiModule {}