VS Code: azurite.location enhancements

### Which service(blob, file, queue, table) does this issue concern?

All

### Which version of the Azurite was used?

3.11.0

### Where do you get Azurite? (npm, DockerHub, NuGet, Visual Studio Code Extension)

VS Code

### What's the Node.js version?

N/A

### What problem was encountered?

If `azurite.location` is set to a directory that doesn't exist, Azurite will fail to start with an `ENOENT` exception. I would argue that the extension should at least attempt to create the directory if it doesn't exist.

Additionally, it seems that tokens like `${workspaceFolder}` are not expanded. It would be nice to add support for these.

### Steps to reproduce the issue?

Set `azurite.location` to a directory that doesn't exist.

Add `${workspaceFolder}` somewhere in the `azurite.location` value.

### Have you found a mitigation/solution?

No.