Implemented Queue Delete Message

[Alexei-B]

PR to address #21

To complete the message lifecycle for Azure Storage Queue we need the ability to delete messages.
To enable this, I have made the Message struct public, and used it as the required parameter to the new DeleteMessageBuilder request's method with_message. This sets the messageid URL path parameter, as well as the popreceipt query parameter.
I have added an example to show how the API can be used.

[ghost]

All CLA requirements met.

[MindFlavor]

Nice work, thank you!

I just have one suggestion to make the API cleaner but it's optional (we can add it a later time). Just tell me if you want me to merge this as it is and I'll do it.

[Alexei-B]

Nice work, thank you!

I just have one suggestion to make the API cleaner but it's optional (we can add it a later time). Just tell me if you want me to merge this as it is and I'll do it.

I'm ready for this to be merged, happy to add the protection against calling execute without a pop receipt if you don't beat me to it.

[MindFlavor]

I'm ready for this to be merged, happy to add the protection against calling execute without a pop receipt if you don't beat me to it.

Ok as soon as the checks complete I'll merge it and open the issue for the compile-time checks.
If you are up to it I'll leave you to implement it (it's your code after all, you deserve all the credit 👍!)