feat: Storage options for EC2 and ECS

[kichik]

Set volume type, IOPS and throughput with storageOptions for EC2 and ECS providers.

new Ec2RunnerProvider(stack, 'EC2 Linux', {
  labels: ['ec2', 'linux', 'x64'],
  storageSize: cdk.Size.gibibytes(500),
  storageOptions: {
    volumeType: EbsDeviceVolumeType.IO1,
    iops: 30000,
  },
});

Resolves #621