[Feature]: Please add an official Restore-AzStorageBlob cmdlet for soft-deleted blobs

### Description of the new feature

Users are seemingly unable to have a simple Az PowerShell cmdlet to restore soft-deleted blobs on flat hierarchical namespace Storage Accounts. While we can run the following to achieve such result:

```powershell
Get-AzStorageBlob -Context $storageAccountContext -Container $containerName -IncludeDeleted `
| Where-Object { $_.IsDeleted } `
| ForEach-Object {
$_.BlobClient.Undelete()
}
```

This implementation doesn't take advantage of the `LimitedConcurrencyTaskScheduler` implementation used by other Az PowerShell Storage cmdlets like `Remove-AzStorageBlob` and would be ultimately much slower when recovering soft-deleted blobs in the order of millions.

### Proposed implementation details (optional)

The cmdlet can be used to simplify soft-deleted blobs by making calls such as:

```powershell
Get-AzStorageBlob -Context $storageAccountContext -Container $containerName -IncludeDeleted `
| Where-Object { $_.IsDeleted } `
| Restore-AzStorageBlob
```

Read the implementation of Remove-AzStorageBlob and its LimitedConcurrencyTaskScheduler usage, then compare it with the Get-AzStorageBlob deleted-blob pipeline and the BlobClient.Undelete() example. Done means an official Restore-AzStorageBlob accepts the proposed pipeline and restores soft-deleted blobs at scale using the existing concurrency approach.

Written by the indexing model from the issue text.