Add a command plugin to download AWS model files

[adam-fowler]

Add soto.config.json to your project

{
    "services": {
        "s3": {}
    }
}

Run

swift package plugin download-aws-models

Build

[0xTim]

LGTM - only comment would be we might want to investigate Swift Subprocess in case that provides a better APIs for shelling out

[adam-fowler]

LGTM - only comment would be we might want to investigate Swift Subprocess in case that provides a better APIs for shelling out

Subprocess requires 6.2. Maybe at a later date