feat(guild): enable CORS and add members listing API

src/members/members.controller.ts

@@ -0,0 +1,13 @@
+import { Controller, Get, Query } from '@nestjs/common';
+import { MembersService } from './members.service';
+
+@Controller('members')
+export class MembersController {
+  constructor(private readonly membersService: MembersService) {}
+
+  @Get()
+  list(@Query('guildId') guildId?: string) {
+    return this.membersService.list(guildId);
+  }
+}
+