board_azure should allow setting the path to the board

[hongooi73]

Currently, board_azure doesn't have any facility to specify where the board is located inside the container. However, all storage services that AzureStor supports (file, blob, ADLS2) can have directories, like with a local disk, so there is no reason not to allow it.

I can make a PR for this.

[hongooi73]

This is basically the equivalent of specifying a prefix with S3; you can actually do the same with Azure blobs, but using directory syntax seems more straightforward and also generalises to file and ADLS2 storage.

[hadley]

Yeah, a PR would be great.

[github-actions]

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