Generated Client SDK

[smkhalsa]

We should explore creating a client generator that simply wraps a TypedLink and provides typed access to all operations.

Rather than instantiating an operation request and manually executing it on a TypedLink, we could generate the client (based on operations in .graphql files) then execute the operations as method calls directly on the client. For example:

import 'path/to/generated/client';

final client = Client(typedLink: someLink);

Then we could execute operations:

final todos = await client.query.getTodos((b) => b..vars.offset = 10).first;

Or access the cache:

final myTodo = await client.readFragment.Todo((b) => b.id = "123");

[smkhalsa]

Upon further thought, I think the sdks should be broken out:

1. ClientSDK: allows for executing graphql operations
2. CacheSDK: allows for reading and writing to / from the cache