[Feature]: New-AzStorageBlobSASToken New-AzStorageAccountSASToken etc should support -AsSecureString

### Description of the new feature

I'm creating a SAS url with New-AzStorageBlobSASToken and writing it to an AKV using Set-AzKeyVaultSecret.

Set-AzKeyVaultSecret expects a securestring, and when it doesn't get one, PowerShell is helpful and prints out the whole value. :-)

The `New-AzStorage*SASToken` powershell cmdlets should support an `-AsSecureString` parameter, which changes the return value to a secure string, similar to how Get-AzAccessToken handles it.

### Proposed implementation details (optional)

_No response_