Migrate listener observed block from redis to db

[Intizar-T]

Description

Implement nodemon for having hot reload running services (listener, worker, reporter):

• Note: hot reload in this case means recompile and restart the service

Migrate listener observed block from redis to db:

• write migrate up & down sql files for a new table to keep track of observed block
• write query, controller function, and add route in api/listener
• write wrapper api function in core/listener
• integrate wrapper api into listener code (replace with redis logic)
• test

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist before requesting a review

• [x] I have performed a self-review of my code.
• [ ] If it is a core feature, I have added thorough tests.

Deployment

• [ ] Should publish npm package
• [x] Should publish Docker image