feat(imagebuilder-alpha): add support for Lifecycle Policy Construct

[tarunb12]

Issue

aws/aws-cdk-rfcs#789

This change adds a new alpha module for EC2 Image Builder L2 Constructs (@aws-cdk/aws-imagebuilder-alpha), as outlined in aws/aws-cdk-rfcs#789. This PR specifically implements the LifecyclePolicy construct.

Description of changes

This change implements the ImageRecipe construct, which is a higher-level construct of CfnLifecyclePolicy.

Example

const graduatedPolicy = new imagebuilder.LifecyclePolicy(this, 'GraduatedPolicy', {
  resourceType: imagebuilder.LifecyclePolicyResourceType.AMI_IMAGE,
  details: [
    {
      // First: Deprecate images after 30 days
      action: { 
        type: imagebuilder.LifecyclePolicyActionType.DEPRECATE,
        includeAmis: true
      },
      filter: { 
        age: Duration.days(30),
        retainAtLeast: 5
      }
    },
    {
      // Second: Disable images after 60 days  
      action: { 
        type: imagebuilder.LifecyclePolicyActionType.DISABLE,
        includeAmis: true
      },
      filter: { 
        age: Duration.days(60),
        retainAtLeast: 3
      }
    },
    {
      // Finally: Delete images after 90 days
      action: { 
        type: imagebuilder.LifecyclePolicyActionType.DELETE,
        includeAmis: true,
        includeSnapshots: true
      },
      filter: { 
        age: Duration.days(90),
        retainAtLeast: 1
      }
    }
  ],
  resourceSelection: {
    tags: { Environment: 'production' }
  }
});

Describe any new or updated permissions being added

N/A - new L2 construct in alpha module

Description of how you validated changes

Validated with unit tests and integration tests. Manually verified generated CFN templates as well.

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