[Routing Preference] Adding routing preferences API changes, private repo PR# 973

[HimanshuChhabra]

…repo PR#973

Latest improvements:

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[AutorestCI]

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[azuresdkci]

Can one of the admins verify this patch?

[sergey-shandar]

https://github.com/Azure/azure-rest-api-specs-pr/pull/973