import relations as ts types to fix circular imports

[rhyek]

Fixes #60

Proposed Changes

• Import generated relation types both as classes for use in ApiProperty decorators, but also as TypeScript types for use as the field type definition to avoid circular import errors when building the project.

Example of the result:

import { users, type users as usersAsType } from './users';
import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';

export class identities {
  @ApiProperty({ type: () => users })
  users: usersAsType;
}