Add openedx/enterprise-subsidy to devstack

[iamsobanjaved]

Under #80, we need to add openedx/license-manager to devstack. Follow the tasklist and also add this tasklist on the PR as a reviewer checklist.

Repo: https://github.com/openedx/enterprise-subsidy

Tasks

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1. Add the service in docker-compose.yml file, follow docker-compose.yml file from the source repo.
2. Add dev.shell make command if some extra env variables need to be set
3. Add an entry in check.sh if needed
4. Mount volume in docker-compose-host.yml file
5. Add entry in options.mk file
6. Create provision-IDA_NAME.sh file if needed. Also, add an entry in provision.sh file.
7. Create table in provision.sql file if needed
8. Add an entry in repo.sh file.
9. Add an entry in service_list.rst file.