Resolve "Send events information to StatsDB"

Description

• Added a new package stats_db to contain grpc proto files and autogenerate files to make grpc calls to stats_db server.

Checklist

• I have update updated the @version string in main.go. See https://semver.org/
• I have update CHANGELOG.md with a short description of changes.
• I have run swag init to update the swagger docs.

Closes #63 (closed)