Revert "Move lazy_init under scipp folder again"

This reverts commit 7d4aede.

Author: franzpoeschel

CMakeLists.txt

@@ -666,7 +666,7 @@ if(openPMD_HAVE_PYTHON)
         ls/__init__.py   ls/__main__.py
         pipe/__init__.py pipe/__main__.py
         scipp/__init__.py scipp/loader.py scipp/mesh_loader.py scipp/utils.py
-        scipp/lazy_init.py
+        ScippLazyInit.py
     )
 endif()
 

src/binding/python/openpmd_api/scipp/lazy_init.py renamed to src/binding/python/openpmd_api/ScippLazyInit.py

@@ -1,7 +1,8 @@
 def series_to_scipp(series):
+
     import scipp
 
-    from . import DataLoader
+    from .scipp import DataLoader
 
     dl = DataLoader(series)
     return dl

src/binding/python/openpmd_api/__init__.py

@@ -3,8 +3,8 @@
 from .DaskDataFrame import particles_to_daskdataframe
 from .DataFrame import (iterations_to_cudf, iterations_to_dataframe,
                         particles_to_dataframe)
+from .ScippLazyInit import series_to_scipp
 from .openpmd_api_cxx import *  # noqa
-from .scipp.lazy_init import series_to_scipp
 
 __version__ = cxx.__version__
 __doc__ = cxx.__doc__