Merge branch 'python/addTypedDict' of https://github.com/iscai-msft/typespec into python/addTypedDict

Author: iscai-msft

.chronus/changes/python-addTypedDict-2026-3-21-17-47-3.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+[python] add `typeddict` `models-mode` for Python HTTP client emitter to generated `TypedDict`s for input models