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/main/agent_framework/openai/_responses_client.py

@@ -455,7 +455,7 @@ class OpenAIBaseResponsesClient(OpenAIBase, BaseChatClient):
                         )
                         response_tools.append(
                             WebSearchToolParam(
-                                type="web_search",
+                                type="web_search_preview",
                                 user_location=WebSearchUserLocation(
                                     type="approximate",
                                     city=location.get("city", None),