Ability to produce a `MongoClient`

[emmanuelbernard]

The MongoClientDefinition definition is a good start but additional requirements for configuration will arise. We need to be able to allow a user to do the following

class DatabaseAccessProducer {
    @MongoClientDefinition(name="retail") @Produces
    @ApplicationScope //TODO can the scope be inferred?
    public MongoClient buildMongoClient() {
       return new MongoClient(...);
    }

    //TODO can this whole code be inferred?
    public MongoClient disposeMongoClient(
        @MongoClientDefinition(name="retail") @Disposes MongoClient mongoClient) {
        mongoClient.close();
    }
}