add azure storage support

[askvinni]

Summary

Keeping in mind that I'm not anywhere near proficient in rust, I'm starting to look into arroyo as a possible streaming engine, but noticed it lacks azure support. This PR attempts to fix that.

Should be fairly self explanatory as the object_store crate includes an azure builder. Since Azure has a ton of different authentication methods, I'm opting to only offer it through env vars parsed automatically by the object_store builder (see below)

* AZURE_STORAGE_ACCOUNT_NAME: storage account name
* AZURE_STORAGE_ACCOUNT_KEY: storage account master key
* AZURE_STORAGE_ACCESS_KEY: alias for AZURE_STORAGE_ACCOUNT_KEY
* AZURE_STORAGE_CLIENT_ID -> client id for service principal authorization
* AZURE_STORAGE_CLIENT_SECRET -> client secret for service principal authorization
* AZURE_STORAGE_TENANT_ID -> tenant id used in oauth flows

How I tested these changes

Unit tests, compiled image and ran locally against an azure account, tested both writing to azure with the filesystem sink, as well as the backend checkpointing.

docker run -p 5115:5115 \
  -e ARROYO__CHECKPOINT_URL="https://my-cool-storageaccount.blob.core.windows.net/my-cool-bucket/arroyo-test" \
  -e AZURE_STORAGE_ACCOUNT_NAME= \
  -e AZURE_STORAGE_CLIENT_ID= \
  -e AZURE_STORAGE_CLIENT_SECRET= \
  -e AZURE_STORAGE_TENANT_ID= \
  arroyo-full

To note

The delta sink is untested; I expect it would work based on the underlying filesystem implementation, but can't be sure as I don't have a delta setup. The docs on storage_provider.get_backing_store() confused me a little, as typically azure would contain both the container and the storage account, but the object_store crate also has a few examples that include a URI following the format I passed.

[mwylde]

Sorry for the slow review, this looks good!