Outdated link to "Azure Blob Storage" issue

This part here:

https://docs.hyperlane.xyz/docs/protocol/agents/validators#the-checkpoint-submitter

says:

```
The Azure Blob Storage contribution is still [in progress](https://github.com/eigerco/hyperlane-monorepo/pull/2).
```

But the related issue is closed

https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/4069

Question:

1. is it still in progress?
2. has it been implemented?
