Update swagger decorator Json type mapping

[ashenm]

Fixes

unexpected error occured
SyntaxError: '(' expected. (27:46)
  25 |  external_id: string 
  26 | 
> 27 |  @ApiProperty({type: Record<string, unknown> | unknown[] | boolean | string | number | null})
     |                                              ^
  28 |  metadata: Record<string, unknown> | unknown[] | boolean | string | number | null 
  29 | 
  30 | }

Proposed Changes

• For swagger decorator, use Object for type Json instead of typescript types

[ashenm]

@kimjbstar at your convenience 🙏