Propagate interface fields

[captbaritone]

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This PR changes how interface fields are handled. Previously, each interface implementor was responsible for adding /** @gqlField */ to each field. Even those which were already annotated on one of the interfaces it implements. This was tedious.

The one exception was fields defined with functions on interfaces. Here we would try to propagate the implementation to all implementors. However, there was a bug where we did not propagate the field to transitive implementors.

This PR addresses both issues by automatically propagating all fields to all implementors (including transitive implementors). If an implementor provides its own implementation of a field, the more specific implementation will be used.

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