(ecs-patterns): (Managed instances queue processing constructor)

### Describe the feature

ECS managed instances was introduced recently and it would be great if there is a queue processing constructor, similar to the Fargate and EC2 queue processing constructors..

### Use Case

Currently, I rely on EC2 ASG with queue processing using the ecs-patterns EC2 queue processing constructor to build my stack. However, I plan to swap it out with ECS managed instances.

### Proposed Solution

Create a constructor similar to the EC2 and Fargate's.

### Other Information

_No response_

### Acknowledgements

- [x] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.235.0

### AWS CDK CLI version

2.1101.0

### Environment details (OS name and version, etc.)

MacOS, Linux

Start by locating the ecs-patterns EC2 and Fargate queue processing constructors and the existing ECS managed instances support. Compare their public inputs and behavior, then define the managed-instances equivalent; done means users can build queue processing with ECS managed instances in the same pattern.

Written by the indexing model from the issue text.