Remove custom mappings for resources that are supported by Cloud Control API

[xiehan]

Description

In #547 we did another update of the list of resources supported by Cloud Control. Many of the ones added in this update already had custom mappings in https://github.com/hashicorp/cdktf-aws-cdk/tree/main/src/mapping. For now, the custom mappings will continue to take precedence over the CC implementation. We decided to keep it this way at least for this release because removing a mapping and having it be handled by CC would cause somebody's resource to be destroyed and recreated, which would be a pretty dramatic breaking change for existing users of this adapter.

We do, however, need to rip off the bandaid at some point and remove these custom mappings. My proposal is to do so before the GA release of this adapter.

Custom mappings that can/should be removed as of November 2023:

• [ ] AWS::EC2::VPC
• [ ] AWS::EC2::Subnet
• [ ] AWS::EC2::Route
• [ ] AWS::EC2::RouteTable
• [ ] AWS::EC2::VPCGatewayAttachment
• [ ] AWS::ElasticLoadBalancingV2::LoadBalancer
• [ ] AWS::Events::Rule
• [ ] AWS::IAM::Role

References

• #547

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[sapslaj]

As of this writing, there doesn't seem to be a way to disable the built-in custom mappings as they are global. So there are two things in my mind that would make removing them more viable:

1. Refactor mappings to be tied to a particular AwsTerraformAdapter instance instead of being global.
2. Add a config/props type for AwsTerraformAdapter and add an option like enableBuiltinMappings that defaults to true. That way downstream consumers can just disable that config option and instantly see what the effects are without having to jump between major versions.

I'll admit it's quite a bit of overhead for a library that isn't GA yet, but I think a little bit of effort could be made to at least make the change less disruptive. Currently there isn't even a good way to revert those custom mappings since the object that holds those mappings is both global and unexported and you may only add new mappings or lookup an existing mapping by key; you cannot easily remove mappings. This is exacerbated by createGenericCCApiMapping not being exported so you can't just registerMapping('AWS::EC2::VPC', createGenericCCApiMapping('AWS::EC2::VPC')) to get the non-custom mappings yourself; it's a much more tedious process.