[#6346] Add Azure Storage (BlobStorage.cs) using a managed identity

[Cecilia Avila (ceciliaavila)]

Fixes #6346

Description

This PR enables MSI authentication for Azure Blob Storage.

Specific Changes

• Added a new constructor with the necessary parameters for creating the blob storage client using a tokenCredential.

Testing

The following image shows a bot saving data in the blob storage after using the tokenCredential to authenticate.

The following image shows the new unit test passing.

[Coveralls (coveralls)]

Pull Request Test Coverage Report for Build 352848

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.003%) to 78.98%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetNextViableTime.cs	1	90.91%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetPreviousViableTime.cs	1	90.91%

Totals
Change from base Build 351887:	-0.003%
Covered Lines:	25914
Relevant Lines:	32811

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💛 - Coveralls