Split azure/cli/command_modules/keyvault/vendored_sdks into it's own python package

[p3ck]

Related command
az keyvault security-domain download

Is your feature request related to a problem? Please describe.
This request is to split the vendored_sdks into a separate python package which can be used by both azure-cli and the azure ansible package (https://github.com/ansible-collections/azure/).

I'm unable to find if this code lives in any other repository or python library.

Describe the solution you'd like
Splitting the vendored_sdks into a subpackage will allow us to share this code without conflicting.

Describe alternatives you've considered
I'm also unable to simply depend on azure-cli package since the two projects have conflicting requirements on the azure-mgmt-* packages

Additional context
My PR in the azure ansible collection:
ansible-collections/azure#1717

Thanks

[yonzhan]

Thank you for opening this issue, we will look into it.

[evelyn-ys]

@chlowell from Python SDK team for awareness