Download an atmos.yaml base line configuration with a subcommand

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## Describe the Feature

It's difficult to get atmos working out of the box without prior knowledge of the atmos.yaml file. It would be nice to use an atmos subcommand to download an atmos.yaml file with some sane common defaults which could then be modified by the user.

## Describe Ideal Solution

```
# download default
# location could be https://github.com/cloudposse/atmos/v1.7.2/configs/default.yaml
atmos config init

# download default + atlantis integration
# location could be https://github.com/cloudposse/atmos/v1.7.2/configs/atlantis.yaml
atmos config init --flavor atlantis

# download default + terragrunt integration
# location could be https://github.com/cloudposse/atmos/v1.7.2/configs/terragrunt.yaml
atmos config init --flavor terragrunt
```

## Alternatives Considered

- add a configs dir to atmos repo
- Download using curl instead of an atmos subcommand

## Additional Context

N/A