Adding Shared Access resource support for azure

[cryptoe]

Description

Azure Blob storage has multiple modes of authentication. One of them is Shared access resource
. This is very useful in cases when we do not want to add the account key in the druid properties .

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Added a new config sharedAccessStorageToken which can be passed as part of azure properties to enable this behavior. Users can either set the key or the sharedAccessStorageToken but not both for authenticating with azure blob storage.

Key changed/added classes in this PR

• extensions-core/azure-extensions/src/main/java/org/apache/druid/storage/azure/AzureAccountConfig.java
• extensions-core/azure-extensions/src/main/java/org/apache/druid/storage/azure/AzureStorageDruidModule.java

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[abhishekagarwal87]

Minor comments. LGTM otherwise.