Task: CosmosDB: configure VNet rules

[jpflueger]

Allow the customer to configure multiple VNet rules.

Implementation Notes
We can create a list on the spec that allows users to configure multiple virtual network rules. The VirtualNetworkRules property on the CreateOrUpdate request allows you to enable network rules for multiple Virtual Network + Subnet combos using two properties:

• ID: Resource ID of a subnet

/subscriptions/{subscriptionId}/resourceGroups/{groupName}/providers/Microsoft.Network/virtualNetworks/{virtualNetworkName}/subnets/{subnetName}

• IgnoreMissingVNetServiceEndpoint: Create firewall rule before the virtual network has vnet service endpoint enabled.

Done criteria

• The user is able to enable ACL rules from a Virtual Network and Subnet