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##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Add support for `MaxInstanceLifetime` option to AWS ec2_asg module.
AWS feature introduction link: https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-ec2-auto-scaling-supports-max-instance-lifetime/

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ec2_asg

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Usage example:
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- ec2_asg:
    name: myasg
    region: us-east-1
    launch_config_name: my_new_lc
    min_size: 1
    max_size: 5
    desired_capacity: 3
    max_instance_lifetime: 604800  # seconds
```

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ag['AvailabilityZones'] = availability_zones
        if vpc_zone_identifier:
            ag['VPCZoneIdentifier'] = vpc_zone_identifier
        try:
            update_asg(connection, **ag)
            if metrics_collection:
                connection.enable_metrics_collection(AutoScalingGroupName=group_name, Granularity=metrics_granularity, Metrics=metrics_list)
            else:
                connection.disable_metrics_collection(AutoScalingGroupName=group_name, Metrics=metrics_list)
        except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
            module.fail_json(msg="Failed to update autoscaling group: %s" % to_native(e),
                             exception=traceback.format_exc())
        if notification_topic:
            try:
                put_notification_config(connection, group_name, notification_topic, notification_types)
            except botocore.exceptions.ClientError as e:
                module.fail_json(msg="Failed to update Autoscaling Group notifications.",
                                 exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
            except botocore.exceptions.BotoCoreError as e:
                module.fail_json(msg="Failed to update Autoscaling Group notifications.",
                                 exception=traceback.format_exc())
        if wait_for_instances:
            wait_for_new_inst(connection, group_name, wait_timeout, desired_capacity, 'viable_instances')
            
            if load_balancers:
                module.debug('\tWAITING FOR ELB HEALTH')
                wait_for_elb(connection, group_name)
            
            if target_group_arns:
                module.debug('\tWAITING FOR TG HEALTH')