* Add support for composite primary keys in schema builder
* Add AnyQueryAddressableProperty and QueryAddressableProperty protocols.
* Require AnyObject for AnyID so we can mutate through it
* Go through anyID instead of _$id where possible
* Add definition of @CompositeID property wrapper
* Add missing support for composite foreign keys in schema builder while we're here
* Conform GroupPropertyPath conditionally to [Any]QueryAddressableProperty
* Enable logging in FluentKit's base tests
* Add composite ID test benchmarks
* CI fixup and improvements