A type for ARNs with the ability to parse/construct them

[jbg]

Describe the feature

A type representing an Amazon Resource Name (ARN), with the ability to construct an ARN from constituent parts and encode it as a string, as well as the ability to parse a string into an ARN and access the parts in a type-safe manner.

Use Case

Some example uses:

1. Parsing: The ECS API does not include the Task ID in the Task object that it returns from e.g. DescribeTasks. However, the log stream that ECS creates in Cloudwatch Logs has a name which is constructed from the Task ID. It is necessary to parse the Task ARN returned by the ECS API, in order to programmatically determine the name of the log stream corresponding to the task.
2. Construction: It is frequently necessary to construct ARNs when building IAM policy statements.

Currently we are doing these with the aws-arn crate, but it has some quality issues, and it would seem better for the official AWS SDK to provide this functionality.

Proposed Solution

The structure in the existing aws-arn crate seems broadly reasonable, at least as a starting point.

Other Information

No response

Acknowledgements

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[rcoh]

yeah, I think this would be reasonable functionality to provide. We're exclusively focused on the core generated code functionality as we work towards 1.0 but I think this would be a good candidate for something to follow up with shortly thereafter.

If it's helpful, here is the code the SDK uses internally to do arn parsing