Refactor AzureBlob

[bruno-brant]

Class AzureBlob has some issues that need to be addressed in order to raise the bar.

AzureBlob.Container.set has major side effects

A property shouldn't have side effects or perform some deep computation. It also calls async methods it doesn't waits on:

https://github.com/Avanade/Liquid-Application-Framework/blob/3db86aa5390498bc253d7599f0a44f922afc40dc/src/Liquid.OnAzure/Storages/AzureBlob.cs#L30-L32

Transform unreadable ternary into a proper switch-case

https://github.com/Avanade/Liquid-Application-Framework/blob/3db86aa5390498bc253d7599f0a44f922afc40dc/src/Liquid.OnAzure/Storages/AzureBlob.cs#L34-L38

It forcefully creates a container

There's no flag to control whether CreateIfNotExistsAsync is called in this method:

https://github.com/Avanade/Liquid-Application-Framework/blob/3db86aa5390498bc253d7599f0a44f922afc40dc/src/Liquid.OnAzure/Storages/AzureBlob.cs#L30

Remove succeeds even if the file doesn't exists

The method Remove hurst the principle of least surprise by calling DeleteIfExists, meaning that callers won't know if some error happens.

https://github.com/Avanade/Liquid-Application-Framework/blob/d3c19c13217053a7fa2ac0072fe9330b626e3a76/src/Liquid.OnAzure/Storages/AzureBlob.cs#L109-L114

HealthCheck is completely broken

More info on #165.