Azure Functions Blob Storage Mount

#### What problem would the feature you're requesting solve? Please describe.
In Azure Web App we can mount a Blob Storage (not a file share) directly to a local folder. This great! For example, this allows to use memory mapping large Arrow Files. It also makes interaction with existing simple i/o code easier

#### Describe the solution you'd like
I just want that feature for Azure Functions, too. Some of my customers would say something like "You can only copy&paste this, right?" ;)

#### Describe alternatives you've considered
Well of course I can work around certain stuff by using the Azure Packages. However I cannot memory map files this way