[Python] Azure with SAS Keys

### Describe the bug, including details regarding any error messages, version, and platform.

Initialising an Azure Filesystem object with a SAS key seems to produce a URL in the incorrect order and errors. The final URL that I assume is being used to query Azure is then shown in the error message.

I would have expected a URL of the form `https://{account_name}.dfs.core.windows.net/path/to/file?{saskey}`.

However instead the error message shows: `https://{account_name}.dfs.core.windows.net/{saskey}/path/to/file`. On reading a file, it errors.

I can successfully read the file using an account key.
However I can't use the default credential unless there's a way to customise the credentials searched and don't want to use account keys for general use. So will need to generate sas keys using the Azure SDK.

### Component(s)

Python