Remove src/stpipe/extern as configobj now comes from astropy

pyproject.toml

@@ -73,9 +73,6 @@ addopts = [
     "-ra",
     "--color=yes"
 ]
-norecursedirs = [
-    'src/stpipe/extern',
-]
 testpaths = [
     'tests',
 ]
@@ -96,7 +93,6 @@ src = [
 line-length = 88
 extend-exclude = [
     'docs',
-    'src/stpipe/extern',
     'scripts/strun',
 ]
 
@@ -156,14 +152,10 @@ force-exclude = '''
     | \.git
     | \.pytest_cache
     | \.tox
-    | src/stpipe/extern
   )/
 )
 '''
 
-[tool.flynt]
-exclude = ["src/stpipe/extern/*"]
-
 [tool.codespell]
 skip="*.pdf,*.fits,*.asdf,.tox,build,./tags,.git,docs/_build"
 # ignore-words-list="""

src/stpipe/extern/__init__.py

@@ -1,8 +0,0 @@
-"""
-This package contains python package(s) that are bundled with jwst but are
-external to jwst, and hence are developed in a separate source tree.
-
-Currently the bundled external dependencies are:
-
-.. _ConfigObj: https://github.com/DiffSK/configobj
-"""

src/stpipe/extern/configobj.py

@@ -0,0 +1,19 @@
+import inspect
+import sys
+import warnings
+
+from astropy.extern import configobj
+
+# Add submodules to system modules so they are available under the same path
+for mod in inspect.getmembers(configobj, inspect.ismodule):
+    # add as a local variable
+    locals()[mod[0]] = mod[1]
+    # Add the submodule to the system modules so it can be imported
+    sys.modules[f"stpipe.extern.configobj.{mod[0]}"] = mod[1]
+
+
+warnings.warn(
+    "stpipe.extern.configobj is deprecated in favor of astropy.extern.configobj, "
+    "please use that instead.",
+    DeprecationWarning,
+)