feat(ec2): add availabilityZoneId support for subnets

[philcali]

Reason for this change

The L1 construct CfnSubnet contains the ability to pass the targeted availabilityZoneId for subnet creation, while the L2 constructs do not. Rather than introducing a backwards incompatible change, this change proposes an optional flag to let the user inform the library that the availabilityZone is actually to be used as the availabilityZoneId.

Description of changes

• Added an optional availabilityZoneAsId flag that defaults to false
• Updates the subnet creation attempt to use availabilityZoneId if the availabilityZoneAsId flag is true

Description of how you validated changes

• Existing unit tests pass

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 64cf467
• Result: SUCCEEDED
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