Remove AutoCompactionSettings and FastWarmupSettings from IBucketConfig

In some cases the server returns a boolean value for these config elements and at other times it sends an object. During serialization, the client will throw an exception of it receives a type that it doesn't expect:

Newtonsoft.Json.JsonSerializationException: Error converting value False to type 'Couchbase.Configuration.Server.Serialization.FastWarmupSettings'. Path '[0].fastWarmupSettings', line 1, position 1899. ---> System.ArgumentException: Could not cast or convert from System.Boolean to Couchbase.Configuration.Server.Serialization.FastWarmupSettings.

Since the client does not use these settings, they can be removed.