encryption support for azblob

[Xuanwo]

Add server side encryption support for azblob.

This is a bit complete and requires developers to know about what's server side encryption:

https://learn.microsoft.com/en-us/azure/storage/common/storage-service-encryption

[morristai]

Hi @Xuanwo, I took a look at the issue description and would like to try on this issue. However, I would like to confirm a few things first:

1. Regarding the issue description of "server-side encryption support," Azure Storage encryption cannot be disabled. Azure encrypts all data at rest, whether the user wants it or not. The only difference is in the key management options.
   Both Microsoft-managed keys and customer-managed keys are managed by Microsoft inside Azure. This leaves the option of customer-provided keys. With customer-provided keys, users can provide their own encryption keys, which are managed outside of Azure Key Vault. Users can specify the encryption key during blob upload or create an encryption scope to associate with a container.
2. If the above statement matches your proposal within this issue, then what is your idea for the scope of codebase changes for this feature? (e.g. adding customer_provided_key to AzblobBuilder struct and building from there)

[Xuanwo]

Thanks a lot for the research! I think we need the following changes:

• Add encryption_key, encryption_key_sha256 and encryption_algorithm in AzblobBuilder
• Provide a encryption_with_customer_provided_key(key: &str) helper function which helps users set encryption_key, encryption_key_sha256 and encryption_algorithm easier.

Take s3's server_side_encryption and server_side_encryption_with_aws_managed_kms_key as reference.

[Xuanwo]

Fixed by #2347, thank @morristai 's hard work!