Move SAS generation into core from the various services

[gearama]

Describe the bug we have SAS tokens in mutiple places. It would be a good candidate for Azure::Core we should look into moving it there. We need to keep in mind the various permission enums , service enums etc . look into either template or parameters etc.

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[ahsonkhan]

Which services that we support currently use SAS tokens for authentication? We should be cautious in moving things to core that may not be as forward looking compared to other auth mechanisms.

[gearama]

not in scope as we want to move towards passwordless auth methods