Add support for Blob Batch

[DmitrySamoylov]

Hi everyone!

I want to bulk delete multiple blobs in a single API call, but it seems to be missing in azure_storage_blobs :thinking:

API: https://docs.microsoft.com/en-us/rest/api/storageservices/blob-batch

[bmc-msft]

For whoever implements this, this is very similar to Transactions in azure_data_tables.

refs:

• https://github.com/Azure/azure-sdk-for-rust/blob/main/sdk/data_tables/src/operations/transaction.rs
• https://github.com/Azure/azure-sdk-for-rust/blob/main/sdk/data_tables/src/transaction.rs
• https://github.com/Azure/azure-sdk-for-rust/blob/main/sdk/data_tables/src/transaction_operation.rs

[rylev]

My question is how we should expose this to end users? Should the user use a "batch" operation, or should we provide separate methods for the two batch operations that are permitted?