[#114] Add yaml configuration controllers

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/plugins/__init__.py

@@ -17,3 +17,16 @@ def load_plugin(plugin_group: str, name: str) -> Any:
         return None
     plugin = plugins[name]
     return plugin.load()
+
+
+def load_all(group: str) -> Any:
+    """Loads all plugins using entry point specification.
+
+    Args:
+        plugin_group: Name of plugin group.
+
+    Returns:
+        Classes from specified group.
+    """
+    plugins = entry_points(group=group)
+    return [plugin.load() for plugin in plugins]