mgmt, support subnet addressprefixes

[XiaofeiCao]

Description

• address [BUG][JAVA SDK]We have observed that the listAvailablePrivateIPAddresses method, which we use to list the available IPs of a subnet, does not work when the subnet has only AddressPrefixes instead of a AddressPrefix. #42457 (comment)
• supported addressPrefixes for Subnet
• docs: https://learn.microsoft.com/en-us/azure/virtual-network/how-to-multiple-prefixes-subnet?tabs=powershell

Decision

• For getter, service model property addressPrefixes is preferred and addressPrefix is used as a fallback, for both implementation of the convenience layer correspondence.
• For setter, setting each property in convenience layer will nullify the other for service model.

Context

• addressPrefixes is the recommended property, and it's not interchangeable with addressPrefix
• according to my test, specifying either one of them during update will successfully update, but not both. if both are present, addressPrefix will override addressPrefixes

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[azure-sdk]

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com.azure.resourcemanager:azure-resourcemanager-network

[weidongxu-microsoft]

@haolingdong-msft Could you also take a look?