Add azure-mgmt-unified-design.md: TypedDict-driven Azure management SDK design document#7

l0lawrence with Copilot wants to merge 4 commits into

mainl0lawrence/azure-sdk-for-python:mainfrom

copilot/create-azure-management-gistl0lawrence/azure-sdk-for-python:copilot/create-azure-management-gistCopy head branch name to clipboard