[services] Tunnelbroker - Add config ini file for dev-mode

Summary:
Introducing configuration file for tunnelbroker dev-mode.
This configuration file will be loaded on the dev-mode service start.
To use the local rabbitMQ docker container we will use amqp.uri = amqp://comm:comm@rabbitmq connection string parameter which corresponds the docker-compose settings.

For the local dynamoDB (localstack) docker image *-test tables we are using the dynamodb table names section, which contains test table names.

Linear task: ENG-1101

Test Plan: Replace tunnelbroker.ini with tunnelbroker-dev.ini file and start the service yarn run-tunnelbroker-service.

Reviewers: karol-bisztyga, palys-swm

Reviewed By: karol-bisztyga, palys-swm

Subscribers: ashoat, palys-swm, Adrian, atul, karol-bisztyga, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4127