feat(api): initial implementation of the auth system (#30)

Adds the auth system but does not add all required features. They will be handled in other tickets

server/entity/Session.ts

@@ -0,0 +1,15 @@
+import { ISession } from 'connect-typeorm';
+import { Index, Column, PrimaryColumn, Entity } from 'typeorm';
+
+@Entity()
+export class Session implements ISession {
+  @Index()
+  @Column('bigint')
+  public expiredAt = Date.now();
+
+  @PrimaryColumn('varchar', { length: 255 })
+  public id = '';
+
+  @Column('text')
+  public json = '';
+}