[Feature]: New-AzBastionTunnel?

### Description of the new feature

It would be nice to have the equivalent of Azure Bastion from Azure CLI

```
az network bastion tunnel `
--name $BastionName `
--resource-group $ResourceGroupName `
--target-resource-id $TargetResourceId `
--resource-port 3389 `
--port $LocalPort
```

### Proposed implementation details (optional)

_No response_

Start by examining the Azure CLI `az network bastion tunnel` command in the issue and the existing Azure PowerShell Bastion functionality. Define what the proposed `New-AzBastionTunnel` cmdlet must support for the listed Bastion name, resource group, target resource ID, resource port, and local port; done means equivalent tunnel behavior is available and verified.

Written by the indexing model from the issue text.