Function setup_datanode_plugins_post_build 

pub async fn setup_datanode_plugins_post_build(
    plugins: &mut Plugins,
    plugin_options: &[PluginOptions],
    builder: &DatanodeBuilder,
) -> Result<()>

Sets up datanode plugins after the DatanodeBuilder is constructed but before DatanodeBuilder::build().

Plugins can read context from the builder (e.g., kv_backend, options) and insert additional plugins. After this call, DatanodeBuilder::set_plugins() should be called to sync plugins into the builder.