Python: Context providers abstraction and Mem0 implementation (#631)

* Added context provider abstractions

* Added mem0 implementation

* Example and small fixes

* Added unit tests for agent

* Added unit tests for mem0 provider

* Updated README

* Small doc updates

* Update python/packages/mem0/agent_framework_mem0/_provider.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Small fixes in tests

* Renaming based on PR feedback

* Small fixes

* Added tests for AggregateContextProvider

* Small improvements

* More improvements based on PR feedback

* Small constant update

* Added more examples

* Added README for Mem0 examples

* Small updates to API

* Updated initialization logic

* Updates for context manager

* Updated Context class

* Dependency update

* Revert changes

* Fixed tests

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Chris <66376200+crickman@users.noreply.github.com>

python/packages/mem0/tests/test_cross_package.py

@@ -0,0 +1,28 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+
+def test_self_through_main() -> None:
+    try:
+        from agent_framework.mem0 import __version__
+    except ImportError:
+        __version__ = None
+
+    assert __version__ is not None
+
+
+def test_self() -> None:
+    try:
+        from agent_framework_mem0 import __version__
+    except ImportError:
+        __version__ = None
+
+    assert __version__ is not None
+
+
+def test_agent_framework() -> None:
+    try:
+        from agent_framework import __version__
+    except ImportError:
+        __version__ = None
+
+    assert __version__ is not None