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Add support of Azure standard load balancer and public IP
**What this PR does / why we need it**:
This PR adds a new configure `loadBalancerSku` and `excludeMasterFromStandardLB` to support Azure standard load balancer and public IP.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
First step of #60485
**Special notes for your reviewer**:
This is the first step of #60485, and only VMAS is supported yet. VMSS support will be added in a following PR.
**Release note**:
```release-note
Azure cloud provider now supports standard SKU load balancer and public IP. To use it, set cloud provider config with
{
"loadBalancerSku": "standard",
"excludeMasterFromStandardLB": true,
}
If excludeMasterFromStandardLB is not set, master nodes are also added to the backend of standard LB.
```
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