Add comments to Prisma Schema and GraphQL server (#162)

* Lowercase all relations in prisma/graphql schema

* Add Comments data model and graphql schema

* Make comments availalble on the api through resolvers and guard them

* Update front graphql schema

* Fix PR

server/src/api/@generated/comment-thread-target/comment-thread-target.model.ts

@@ -0,0 +1,32 @@
+import { Field } from '@nestjs/graphql';
+import { ObjectType } from '@nestjs/graphql';
+import { ID } from '@nestjs/graphql';
+import { CommentableType } from '../prisma/commentable-type.enum';
+import { CommentThread } from '../comment-thread/comment-thread.model';
+
+@ObjectType()
+export class CommentThreadTarget {
+  @Field(() => ID, { nullable: false })
+  id!: string;
+
+  @Field(() => Date, { nullable: false })
+  createdAt!: Date;
+
+  @Field(() => Date, { nullable: false })
+  updatedAt!: Date;
+
+  @Field(() => Date, { nullable: true })
+  deletedAt!: Date | null;
+
+  @Field(() => String, { nullable: false })
+  commentThreadId!: string;
+
+  @Field(() => CommentableType, { nullable: false })
+  commentableType!: keyof typeof CommentableType;
+
+  @Field(() => String, { nullable: false })
+  commentableId!: string;
+
+  @Field(() => CommentThread, { nullable: false })
+  commentThread?: CommentThread;
+}