Commits on May 6, 2021

1. feat: Log when any stateful resource is in stack …

   A resource is a raw CloudFormation item.
   
   A construct is CDK's L1 or L2 abstraction of a resource.
   
   A stateful resource can be defined as something that holds state.
   This could be a database, a bucket, load balancer, message queue etc.
   
   This change will, upon stack synthesis, walk the tree of resources
   and log a warning for all the stateful resources we have identified.
   
   This does mean we end up keeping a list of these resources,
   which is not ideal...
   
   The `GuStatefulMigratableConstruct` mixin performs a similar role here,
   however that only operates against the constructs that exist in the library.
   
   Ideally we'd be able to use Stack Policies to protect these resources.
   However they are not currently supported in CDK.
   
   See:
     - https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_core.Construct.html#protected-prepare
     - https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/protect-stack-resources.html
     - aws/aws-cdk-rfcs#72

   

   akash1810 committed May 6, 2021
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