Create the ResourceGroup if not exist when create a new resource

In AWS powershell modules, when user create a new resource, if the resource group is not exist, cmdlet will create a new resource group for them. We can add ShouldProcess to protect user input a wrong resource group name.
* Reporter
* Yunchi Wang
* Applied to all generated modules (MySql module has this requirement)

* Examples
```
New-AzResourcegroup -Name wyunchi-costmanagement -Location eastus
New-AzStorageAccount -ResourceGroupName wyunchi-costmanagement -Name wyunchistorageaccount -SkuName Standard_LRS -Location eastus
```