Implement provider for azure blob storage

[anqiuy]

Ticket

NII Feature development Waterbutler
#44

Purpose

Add Azure Blob Storage provider support to WaterButler with OAuth2 authentication and full CRUD operations.

Changes

• Implemented Azure Blob Storage provider with OAuth2 authentication
• Added comprehensive metadata handling for files and folders
• Implemented folder simulation using .osfkeep files
• Added multi-part upload support and proper error handling
• Created test cases with Azure API-compliant fixtures

Side effects

None. New provider implementation does not affect existing providers.

QA Notes

Deployment Notes

[anqiuy]

@felliott could you please help review my changes for azure blob storage?

[felliott]

I've merged develop into feature/azure-blob-storage to help condense the diff here. I will review it today.

[anqiuy]

I've merged develop into feature/azure-blob-storage to help condense the diff here. I will review it today.

Thank you so much for your help. The PR now only includes the changes related to Azure Blob, which makes it much clearer.

[anqiuy]

@felliott Could you help review it today? We'd like to start end-to-end testing for this feature in the staging environment as soon as possible.
Also, the change in CenterForOpenScience/osf.io#11255 is intended to fix an issue where the API service couldn't correctly resolve the gravyvalet addon. After confirming with Brian J. Geiger and @adlius, we decided to apply this fix specifically for the AzureBlobStorage file node. As I understand it, this is meant to be a temporary solution, and a more unified approach to handling the gravyvalet addon will be implemented in the future.

[felliott]

Looks good! Great job on the test suite, you did an excellent job on making them comprehensive and understandable. I have a few small questions and nitpicks, but nothing too substantive. There are a few small flake errors that will prevent CI from running, but once those are fixed, i think it's good to merge. Thank you!

Cheers,
@felliott

[coveralls]

coverage: 84.442% (-0.3%) from 84.753%
when pulling 562e9d8 on anqiuy:feature/azure-blob-storage
into aae81c9 on CenterForOpenScience:feature/azure-blob-storage.

[felliott]

Thanks @anqiuy ! The changes look good, and I have merged the branch.

Cheers,
@felliott