Feature Request: Support for getting all Tags for a resource (Accross all services)

[Ram]

I currently have a use case , where some resources (especially S3 and EC2 in my case) have various tags associated which may have typos and may be non-compliant.

Having a complete tag list for all resources will solve three main issues:-

1. Visibility across all types of tagging keys across .
2. Determining the possible tag filters one may use in her / his environment.

This would be really helpful. However csv structure cannot be predetermined. Possible ways could be to dump raw json response in cache and normalize it and then write it to csv.