[ts] make optional fields work if the key is ommited

[stopachka]

Uri pointed out an issue in #459

If you have a messages entity like so:

messages: i.entity({
  content: i.string(),
  createdAt: i.date().optional(),
}),

Then using InstaQLEntity:

type CoreMessage = InstaQLEntity<AppSchema, "messages">;

const mWithOptionalFieldWorks: CoreMessage = { 
  id: '1', 
  content: 'hello',
};

You end up having an error, because typescript expects createdAt to be present, even though it's optional

Fix

I updated how we resolved attrs, so that instead of generating: createdAt: Foo | undefined, we generate: createdAt?: Foo | undefined

@nezaj @dwwoelfel @tonsky

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[nezaj]

Nice!