Add support for fast snapshot restore

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#### Description

When images are taken and snapshots copied, Packer users should be able to [enable EBS fast snapshot restore](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-fast-snapshot-restore.html) on those snapshots for some list of availability zones. Note that the list of AZs would be per snapshot, which could span regions, so the configuration syntax might get a little hairy.

#### Use Case(s)

Make instance launches not suffer from the degraded performance that comes with launching from an AMI or EBS snapshot while the volume is initializing.

#### Potential configuration

```hcl
source "amazon-ebssurrogate" "foo" {
ami_regions = ["us-east-1", "us-west-2"]

ami_fast_snapshot_restore {
region = "us-east-1"
availability_zones = ["us-east-1a", "us-east-1b"]
}

ami_fast_snapshot_restore {
region = "us-west-2"
availability_zones = ["us-west-2a", "us-west-2b"]
}
}
```

#### Potential References

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-fast-snapshot-restore.html