[services] Dev mode - Add localstack to docker compose

Summary:
Depends on D3695

Adding localstack configuration to the docker-compose.yml file.

Test Plan:

cd services
docker-compose down && docker-compose up localstack

Reviewers: palys-swm, jimpo, ashoat

Reviewed By: jimpo, ashoat

Subscribers: ashoat, palys-swm, Adrian, atul, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3692