Feature request: add support for sam drift

### Describe your idea/feature/enhancement

Provide a clear description. Ex. I wish SAM CLI would [...]

I wish sam could make it easy to see and understand drift in provisioned resources through a new `sam drift` command.

### Proposal

Add details of how to add this to the product.

though not ideal, sometimes engineers may change resources provisioned by sam in aws consoles. In these cases you only have one option to detect this, cf. This breaks the “flow” sam cli provides as you have to drop down a level to tools with a lesser quality dx.

`sam deploy` is a good example of a dx enhancement over `cloudformation deploy` . I can see an easily surmised display of my stack state. I would the same for detecting and understanding drift state

Things to consider:
1. Will this require any updates to the [SAM Spec](https://github.com/awslabs/serverless-application-model)

no

### Additional Details