feat: add replica docker compose for grpc demos

PR Checklist

[x] Added label to the Pull Request for easier discoverability and search
[x] Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/retail-use-cases/blob/main/CONTRIBUTING.md
[x] Every commit is a single defect fix and does not mix feature addition or changes
[ ] Unit Tests have been added for new changes
[x] Updated Documentation as relevant to the changes
[ ] All commented code has been removed
[ ] If you've added a dependency, you've ensured license is compatible with repository license and clearly outlined the added dependency.
[ ] PR change contains code related to security
[ ] PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)

close: #520

There are three different pipelines for demos use case: classification, instance_segmentation, and object_detection.

run one classification pipeline
```
make run-demo-classification
```
run one instance segmentation pipeline
```
make run-demo-instance-segmentation
```

run two object detection pipelines

PIPELINE_COUNT=2 make run-demo-object-detection

shutdown classification pipeline Docker container
```
make down-demo-classification
```
shutdown all Docker containers
```
make down-demos-all
```
clean up the output results
```
make clean-results
```