@Alpha
    default Collection<ConfigCustomizerFactory> getConfigCustomizerFactories(ConfigRegistry config) {
        return Collections.emptySet();
    }
Returns a collection of {@link ConfigCustomizerFactory} objects.
<br>
Each factory is called once for every type that is attached by the factory and once for each method in the
type. They can return {@link ConfigCustomizer} instances that will affect the specific configuration for
each method and extension type.

@param config A Configuration registry object that can be used to look up additional information
@return A collection of {@link ConfigCustomizerFactory} objects. Can be empty, must not be null

@since 3.38.0
core/src/main/java/org/jdbi/v3/core/extension/ExtensionFactory.java