public Builder addInstanceConfigCustomizer(ConfigCustomizer configCustomizer) {
            instanceConfigCustomizer.addCustomizer(configCustomizer);
            return this;
        }
Add an instance specific configuration customizer. This customizer will be applied to all methods on the extension type.
@param configCustomizer A {@link ConfigCustomizer}
@return The builder instance
core/src/main/java/org/jdbi/v3/core/extension/ExtensionMetadata.java