Allow declarative/CLI method to import pre-existing resources

[RichiCoder1]

Description

Attempting to transition existing resources from non-CloudFormation (even existing CloudFormation) into the CDK currently is a relatively complicated and manual process that requires synthesizing the stack and going through an error prone process via the CFN CLI or Console.

Use Case

To greatly simplify moving existing resources into the CDK stacks when transitioning from other IaC (or manual) methods of creating resources.

Proposed Solution

In theory, some declarative way like .importResource(<resource-identifier>) on supported resources which gets automatically translated to the appropriate import change set upon either A) a newly created stack or B) if the CDK detects that an import statement is present and there's no underlying resources for a given logical resource in a stack.

Other information

No response

Acknowledge

• I may be able to implement this feature request
• This feature might incur a breaking change

[rix0rrr]

It's not going to be declarative, but @tomas-mazak is cooking something up here: #17666

[github-actions]

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