Add description for Azure url format

[steffansluis]

• Add a table entry for the URL format to make use of dvc import-url with Microsoft Azure Blob Storage.
• Add example for usage of Microsoft Azure Blob Storage with external dependencies.

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Thank you for the contribution - we'll try to review it as soon as possible. 🙏

[efiop]

Thank you for the docs @steffansluis ! 🙏 Could you also add azure to https://dvc.org/doc/user-guide/external-dependencies , please?

[shcheklein]

Thanks @steffansluis 🙏

[jorgeorpinel]

The indentation here seems excessive? Code block lines shouldn't go over 72 characters long, please. How about just align the flags under copy? Or go further back if still they go over 72 🙂

[steffansluis]

The indentation is based on the indentation used in the HDFS example. I completely agree that it is excessive, but I figured there was probably a reason for it. I'll move it back a bit so they line up better with copy, I did check though and the longest line was 67 chars so it should be fine regardless

[jorgeorpinel]

Thanks for bringing this to out attention @steffansluis I'll review this in a separate PR 🙂

[jorgeorpinel]

Just a couple minor comments so far. Thanks for the contribution!

[shcheklein]

Thanks @steffansluis 🙏