Add ability to associate metadata with Storage Account Queues. Metada…

[cmarshall10450]

…ta can be added for a single queue, multiple queues with unique metadata or multiple queues with the same metadata

This PR closes #916

The changes in this PR are as follows:

• Adds ability to add metadata to Storage Account Queues

I have read the contributing guidelines and have completed the following:

• [x] Tested my code end-to-end against a live Azure subscription.
• [x] Updated the documentation in the docs folder for the affected changes.
• [x] Written unit tests against the modified code that I have made.
• [x] Updated the release notes with a new entry for this PR.
• [x] Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

If I haven't completed any of the tasks above, I include the reasons why here: The unit tests don't pass but I could not work out why. I cannot see a difference in the actual and expected values.

Below is a minimal example configuration that includes the new features, which can be used to deploy to Azure:

let storageAccount = storageAccount {
    name = "testaccount"
    add_queue_with_metadata "myqueue" (Map [
        "source", "imageStore"
    ])
}