feat: Introduce Zone-Redundancy interface for Bicep

[AlexanderSehr]

Overview/Summary

Across AVM, we now have several different approach to deploying both zonal & zone-redundant resources. The tricky one is especially the former, as users want the option to not deploy the resource into a zone.

E.g.

@description('Required. If set to 1, 2 or 3, the availability zone is hardcoded to that value. If  set to -1, then availability zones are not used. Note that the availability zone number here are the logical availability zone in your Azure subscription. Different subscriptions might have a different mapping of the physical zone and logical zone.To understand more, please refer to [Physical and logical availability zones](https://learn.microsoft.com/en-us/azure/reliability/availability-zones-overview?tabs=azure-cli#physical-and-logical-availability-zones) and [Distribute VMs and disks across availability zones](https://learn.microsoft.com/en-us/azure/virtual-machines/disks-high-availability#distribute-vms-and-disks-across-availability-zones).')
@allowed([
  -1
  1
  2
  3
])
param availabilityZone int

(source)

vs

@description('Optional. Specifies the availability zone the pool\'s primary replica is pinned to.')
param availabilityZone '1' | '2' | '3' | 'NoPreference' = 'NoPreference'

(source)

vs

@sys.description('Conditional. Configuration of the availability zone for the Elastic SAN. Required if `Sku` is `Premium_LRS`. If this parameter is not provided, the `Sku` parameter will default to Premium_ZRS. Note that the availability zone number here are the logical availability zone in your Azure subscription. Different subscriptions might have a different mapping of the physical zone and logical zone. To understand more, please refer to [Physical and logical availability zones](https://learn.microsoft.com/en-us/azure/reliability/availability-zones-overview?tabs=azure-cli#physical-and-logical-availability-zones).')
@sys.allowed([1, 2, 3])
param availabilityZone int?

(source)

Also, we should probably reference this interface from the Availability Zone spec - but as this is shared across languages, I'm not sure if that makes sense.

[AlexanderSehr]

@Azure/avm-core-team anybody?

Note: We agreed on -1,1,2,3

[eriqua]

🆗