Add support to use federated token file with Azure Blob object store.

[aolear-ss]

Extend existing options to support usage of token file used in Azure Kubernetes Service authentication scenarios with workload identity. This removes the need to manage a client secret while using Azure role-based access to Azure Storage.

Closes #145.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.88%. Comparing base (ef5ed57) to head (c5de4bc).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/object_store/azure.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   90.89%   90.88%   -0.01%     
==========================================
  Files          92       92              
  Lines       10431    10437       +6     
==========================================
+ Hits         9481     9486       +5     
- Misses        950      951       +1     

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[aykut-bozkurt]

Thanks.