feat: apply all decorators with return type PropertyDecorator

[Dominic-Preap]

I would propose all decorators should return PropertyDecorator because this is standard type from typescript and useful when using applyDecorators function from @nestjs. I'll make a PR for that as well.

export const IsOptionalArrayNumber = () =>
  applyDecorators(
    IsOptional() as any, // <--- if it is PropertyDecorator type, it's very useful
    IsArray() as any,
    IsNumber() as any,
    ApiPropertyOptional() // <-- @nestjs decorators also a PropertyDecorator type
  );

[lock]

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