[python] support external type #8767
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fix #8709
azure-core is ready: Azure/azure-sdk-for-python#43051
Since this repo can't keep generated code while we have to add customized code in _patch.py (e.g. here) for test, so we have to add test case in autorest.python repo: https://github.com/Azure/autorest.python/pull/3246/files#diff-0934ce9d44a15f3f825714c63c3c5f13bc242a99dec49efade2742385e2d7d78.
pending on: