waitUntilKeyPairExists
suspend fun Ec2Client.waitUntilKeyPairExists(request: DescribeKeyPairsRequest = DescribeKeyPairsRequest { }): Outcome<DescribeKeyPairsResponse>
suspend fun Ec2Client.waitUntilKeyPairExists(block: DescribeKeyPairsRequest.Builder.() -> Unit): Outcome<DescribeKeyPairsResponse>