@Alpha
    public Extensions registerHandlerCustomizer(ExtensionHandlerCustomizer extensionHandlerCustomizer) {
        extensionHandlerCustomizers.add(0, extensionHandlerCustomizer);
        return this;
    }
Registers a global {@link ExtensionHandlerCustomizer} instance. This customizer is registered globally and will be used
with all registered {@link ExtensionFactory} instances.
@param extensionHandlerCustomizer The {@link ExtensionHandlerCustomizer} to register
@return This instance

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