Generate TS SDK with boolean specifiers that generates query document at runtime?

> Note: this is an experiment

```ts
sdk.query({
user: { id: true, name: true, profile: { age: true }}
})
```

for union/interface:

```ts
sdk.query({
search({ term: ".." }) => ({
__User: { name: true },
__Node: { id: true }
})
})
```

Goals:
* Return `TypedDocumentNode` based on the dynamic selection.
* Acts as a query builder, not a GraphQL client.