[ECS] EFS encryption and IAM authentication support

[samuelkarp]

This issue is tracking adding support for EFS encryption and IAM authentication to the ECS variant of Bottlerocket.

This will require the functionality provided by amazon-efs-utils. This package is written in Python, which is not included in Bottlerocket. To add support for these features, the plugin may need to be packaged as a container or rewritten in a language such as Rust.