Fixing ts syntax compile errors and added fix for resolving external …

[Hless]

The TS compiler threw errors on compilation, so I fixed those.

When you have Furthermore I also added support for circular depencies with external models using a callback. This ensure that the model is available when the decorator resolves the metadata.

// user.entity.ts
@import { AccessToken } from "./acces-token.enitity'; // AccessToken will be 'undefined' in runtime because User and AccessToken depend on each other
class User {
    ...
    
    @ApiModelProperty({ 
        type: type => User ,  // Using function instead of object resolves the cyclic depency issues, since the AccesToken class will be resolved when the decorator runs
        isArray: true 
     })
    @OneToMany(type => AccessToken, accessTokens => accessTokens.user)
    accessTokens:AccessToken[]
}

---
// access-token.entity.ts

@import { User } from "./user.entity";
class AccessToken {
    ...
    @ApiModelProperty({
        type: type => AccessToken,
     }) 
     @ManyToOne(type => User, user => user.accesTokens)
     user:User
}