Enable select HLC methods to use RequestOptions

[tg-msft]

We want to enable select HLC methods to use RequestOptions (Azure/azure-sdk-for-net#25626) and need to figure out the best way to support that via AutoRest. I'd prefer not to generate the ENTIRE protocol layer for Storage just to call two of those methods. Maybe we could do something like add an annotation that either takes a RequestOptions param to existing HLC generated methods, switches to the LLC generator for that method, or any other option that's cheap to implement? This work item is currently just to track the scenario rather than ask for a specific design.

[annelo-msft]

Addressed with: #1991