Omit optional properties by default?

[zhouzi]

From #63 (review):

What do you think about not adding the optional properties at all by default? By default the TypeScript plugins set the properties to title?: Maybe<string> and have an option "avoidOptionals" to remove the ?. So I feel like not adding the optional properties unless "avoidOptionals" is set to true would be closer to the TypeScript plugins' defaults and avoid issues similar to the one you faced.

[jongbelegen]

I think this idea makes sense.

Note that avoidOptionals can be used as a bool or AvoidOptionalsConfig.
For example, my config looks like this:

      avoidOptionals:
        field: true
        inputValue: false
        object: true
        defaultValue: true