Make all module_utils and plugin_utils private (#887)

* Add leading underscore. Remove deprecated module utils.

* Document module and plugin utils as private. Add changelog fragment.

* Convert relative to absolute imports.

* Remove unnecessary imports.

plugins/module_utils/_crypto/_objects.py

@@ -0,0 +1,35 @@
+# Copyright (c) 2019, Felix Fontein <felix@fontein.de>
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Note that this module util is **PRIVATE** to the collection. It can have breaking changes at any time.
+# Do not use this from other collections or standalone plugins/modules!
+
+from __future__ import annotations
+
+from ansible_collections.community.crypto.plugins.module_utils._crypto._objects_data import (
+    OID_MAP,
+)
+
+
+OID_LOOKUP: dict[str, str] = dict()
+NORMALIZE_NAMES: dict[str, str] = dict()
+NORMALIZE_NAMES_SHORT: dict[str, str] = dict()
+
+for dotted, names in OID_MAP.items():
+    for name in names:
+        if name in NORMALIZE_NAMES and OID_LOOKUP[name] != dotted:
+            raise AssertionError(
+                f'Name collision during setup: "{name}" for OIDs {dotted} and {OID_LOOKUP[name]}'
+            )
+        NORMALIZE_NAMES[name] = names[0]
+        NORMALIZE_NAMES_SHORT[name] = names[-1]
+        OID_LOOKUP[name] = dotted
+for alias, original in [("userID", "userId")]:
+    if alias in NORMALIZE_NAMES:
+        raise AssertionError(
+            f'Name collision during adding aliases: "{alias}" (alias for "{original}") is already mapped to OID {OID_LOOKUP[alias]}'
+        )
+    NORMALIZE_NAMES[alias] = original
+    NORMALIZE_NAMES_SHORT[alias] = NORMALIZE_NAMES_SHORT[original]
+    OID_LOOKUP[alias] = OID_LOOKUP[original]