```

feat(plugins): 支持可调用入口点以避免循环导入

在插件注册表中添加对函数入口点的支持，通过检测并调用可调用对象来避免循环导入问题。
这使得入口点可以作为函数定义，而不是直接的类实例，从而提高模块间的解耦性。
```

nerfstudio/plugins/registry.py

@@ -41,6 +41,11 @@ def discover_methods() -> t.Tuple[t.Dict[str, TrainerConfig], t.Dict[str, str]]:
     discovered_entry_points = entry_points(group="nerfstudio.method_configs")
     for name in discovered_entry_points.names:
         spec = discovered_entry_points[name].load()
+
+        # Support callable (function) entry points to avoid circular imports
+        if callable(spec):
+            spec = spec()
+
         if not isinstance(spec, MethodSpecification):
             CONSOLE.print(
                 f"[bold yellow]Warning: Could not entry point {spec} as it is not an instance of MethodSpecification"

nerfstudio/plugins/registry_dataparser.py

@@ -57,6 +57,11 @@ def discover_dataparsers() -> t.Tuple[t.Dict[str, DataParserConfig], t.Dict[str,
     discovered_entry_points = entry_points(group="nerfstudio.dataparser_configs")
     for name in discovered_entry_points.names:
         spec = discovered_entry_points[name].load()
+
+        # Support callable (function) entry points to avoid circular imports
+        if callable(spec):
+            spec = spec()
+
         if not isinstance(spec, DataParserSpecification):
             CONSOLE.print(
                 f"[bold yellow]Warning: Could not entry point {spec} as it is not an instance of DataParserSpecification"