make it possible to load any additional modules not included in pip install earthkit

Author: Oisin-M

src/earthkit/__init__.py

@@ -1,13 +1,3 @@
-# (C) Copyright 2023- ECMWF.
-#
-# This software is licensed under the terms of the Apache Licence Version 2.0
-# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
-# In applying this licence, ECMWF does not waive the privileges and immunities
-# granted to it by virtue of its status as an intergovernmental organisation
-# nor does it submit to any jurisdiction.
-#
-
-
 try:
     # NOTE: the `_version.py` file must not be present in the git repository
     #   as it is generated by setuptools at install time
@@ -24,13 +14,15 @@
 import earthkit.time as time
 import earthkit.transforms as transforms
 
-__all__ = [
-    "data",
-    "geo",
-    "meteo",
-    "plots",
-    "regrid",
-    "time",
-    "transforms",
-    "__version__",
-]
+names = ["data", "geo", "meteo", "plots", "regrid", "time", "transforms"]
+
+
+import importlib
+import pkgutil
+
+for component in pkgutil.iter_modules(__path__, __name__ + "."):
+    module_name = component.name
+    module, alias = module_name.split(".")
+    if alias not in names:
+        imported_module = importlib.import_module(module_name)
+        globals()[alias] = imported_module