Add Python app-server SDK (#14435)

## TL;DR
Bring the Python app-server SDK from `main-with-prs-13953-and-14232`
onto current `main` as a standalone SDK-only PR.

- adds the new `sdk/python` and `sdk/python-runtime` package trees
- keeps the scope to the SDK payload only, without the unrelated
branch-history or workflow changes from the source branch
- regenerates `sdk/python/src/codex_app_server/generated/v2_all.py`
against current `main` schema so the extracted SDK matches today's
protocol definitions

## Validation
- `PYTHONPATH=sdk/python/src python3 -m pytest sdk/python/tests`

Co-authored-by: Codex <noreply@openai.com>

sdk/python/src/codex_app_server/__init__.py

@@ -0,0 +1,10 @@
+from .client import AppServerClient, AppServerConfig
+from .errors import AppServerError, JsonRpcError, TransportClosedError
+
+__all__ = [
+    "AppServerClient",
+    "AppServerConfig",
+    "AppServerError",
+    "JsonRpcError",
+    "TransportClosedError",
+]