To nudge people further towards com.mongodb.client.MongoClient interface and away from com.mongodb.MongoClient, we should:

• Add com.mongodb.MongoClient constructors matching the factory methods in com.mongodb.client.MongoClients
• Add methods to class com.mongodb.MongoClient to match those in interface com.mongodb.client.MongoClient
• Add a method to initialize a MongoClientOptions.Builder from a MongoClientSettings instance
• Add a method to create a MongoClientSettings instance from a MongoClientOptions instance plus connection-related properties