Use reconstructed ListBlobs marker to provide list offset support in MicrosoftAzure store

[andrebsguedes]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
BlobStorage currently does not expose a way to start at a specific location on ListBlobs requests, this makes implementing GC-like routines that lists millions of objects and have to outlive a single process very cumbersome.

Describe the solution you'd like
There is a workaround for this limitation which involves reconstructing the marker token used for list pagination to specify a start key where listing should begin.

Describe alternatives you've considered
There are no efficient alternatives given that ListBlobs only supports prefix filtering.

[tustvold]

Potentially related #5653