ValidateIf should be handled like IsOptional

[Inoir]

If you use ValidateIf in combination with IsDefined on an optional marked property in TS, the linter shows missing IsOptional decorator.

  @ValidateIf((o) => !o.id)
  @IsDefined()
  @IsString()
  key?: string

This should be valid.
Currently @darraghor/nestjs-typed/all-properties-have-explicit-defined throws: Optional properties must have @IsOptional() decorator

[darraghoriordan]

oh yea i dont think i did anything special for validateif. thanks for reporting.

I'll get to this before the end of the year hopefully

[adamvandenhoven]

I've added a PR to implement this requested feature. First time for me, let me know what I've missed.