Python: feat: Add ChatKit integration with a sample application (#1273)

* feat: Add ChatKit integration with a new frontend application

- Created a new frontend application using React and Vite for the ChatKit integration.
- Added essential files including package.json, vite.config.ts, and Tailwind CSS configuration.
- Implemented core components: App, Home, ChatKitPanel, ThemeToggle, and hooks for color scheme management.
- Established SQLite-based store implementation for ChatKit data persistence in store.py.
- Integrated theme toggling functionality for light and dark modes.
- Set up ESLint and TypeScript configurations for better development experience.

* git ignore

* fix mypy

* add mising file

* minimal frontend for chatkit sample

* update ignore files

* version

* set python version lowerbound on chatkit

* update project settings for chatkit

* update setup

* update setup

* update setup

* update setup

* weather widget

* add select city widget sample

* remove widget helper

* update chatkit to include file attachments and cover more thread item types

* update readme with mermaid diagram

* update diagram

* update instructions

* update chatkit dependency

* fix converter imports

* move to demos/

* move to demos/ -- rename references

* support multiple session instead of using global variable in sample

* support chunk streaming

* fix tests

* Update python/samples/demos/chatkit-integration/store.py

Co-authored-by: Evan Mattson <35585003+moonbox3@users.noreply.github.com>

* use local host

---------

Co-authored-by: Evan Mattson <35585003+moonbox3@users.noreply.github.com>

python/pyproject.toml

@@ -26,6 +26,7 @@ dependencies = [
     "agent-framework-a2a",
     "agent-framework-anthropic",
     "agent-framework-azure-ai",
+    "agent-framework-chatkit",
     "agent-framework-copilotstudio",
     "agent-framework-devui",
     "agent-framework-lab",
@@ -89,6 +90,7 @@ agent-framework = { workspace = true }
 agent-framework-core = { workspace = true }
 agent-framework-a2a = { workspace = true }
 agent-framework-azure-ai = { workspace = true }
+agent-framework-chatkit = { workspace = true }
 agent-framework-copilotstudio = { workspace = true }
 agent-framework-lab = { workspace = true }
 agent-framework-mem0 = { workspace = true }
@@ -240,6 +242,7 @@ pytest --import-mode=importlib
 --cov=agent_framework
 --cov=agent_framework_a2a
 --cov=agent_framework_azure_ai
+--cov=agent_framework_chatkit
 --cov=agent_framework_copilotstudio
 --cov=agent_framework_mem0
 --cov=agent_framework_redis