Add new package bindings option This commit adds list of packages for which genqlient should automatically generate bindings; it's equivalent to adding all the exported types in the package to `bindings` explicitly. This can be useful when you're both a client and a server of the same schema and want to share types. We don't recommend doing things that way, but the feature isn't too invasive and may be useful for other purposes. Co-authored-by: Ben Kraft <[email protected]>