doc(hansbug): add doc framework for treetensor.utils

docs/source/api_doc/utils/clazz.rst

+Class Decorators
+============================
+
+.. py:currentmodule:: treetensor.utils
+
+.. automodule:: treetensor.utils.clazz
+
+
+tag_names
+--------------------
+
+.. autofunction:: tag_names
+
+
+inherit_names
+--------------------
+
+.. autofunction:: inherit_names
+
+
+current_names
+--------------------
+
+.. autofunction:: current_names
+
+

docs/source/api_doc/utils/clazz.rstc

-treetensor.utils.clazz
\ No newline at end of file

docs/source/api_doc/utils/func.rst

+Function Decorators
+===========================
+
+.. py:currentmodule:: treetensor.utils
+
+.. automodule:: treetensor.utils.func
+
+
+replaceable_partial
+--------------------------
+
+.. autofunction:: replaceable_partial
+
+
+args_mapping
+--------------------------
+
+.. autofunction:: args_mapping
+
+

docs/source/api_doc/utils/func.rstc

-treetensor.utils.func
\ No newline at end of file

docs/source/api_doc/utils/index.rst

@@ -4,5 +4,6 @@ treetensor.utils
 .. toctree::
     :maxdepth: 3
 
-    clazz.auto
-    func.auto
+    clazz
+    doc
+    func

treetensor/utils/clazz.py

+"""
+Class decorators.
+
+Mainly used for tagging the members of a class, will be used when auto generating the documentation.
+"""
 import types
 from functools import reduce
 from operator import __or__

treetensor/utils/doc.py

+"""
+Documentation Decorators.
+"""
 __all__ = [
     'doc_from',
 ]

treetensor/utils/func.py

+"""
+Functional Decorators.
+"""
 from functools import wraps
 from typing import Callable, Union, Any