tokens: Add token creation

Fix token deletion
Update plantuml docs
Add token validUntil and lastUsed fields

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

src/users/auth-token.dto.ts

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { IsNumber, IsString } from 'class-validator';
+
+export class AuthTokenDto {
+  @IsString()
+  label: string;
+  @IsNumber()
+  created: number;
+  @IsNumber()
+  validUntil: number | null;
+  @IsNumber()
+  lastUsed: number | null;
+}