• azure_keyvault_keys:
• 4.3.1:
• Linux:
• 3.8.5:

Describe the bug
Latest version of Azure.Keyvault SDKs don't have serialization in the models.

Models in this file don't inherit msrest, so there is no easy serialization available.
https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py

Same goes to Secrets and Certificates.

To Reproduce
Steps to reproduce the behavior:
1.

Expected behavior
Azure Python SDK has consistent experience and all models have serialization available.

Screenshots
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Additional context
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