feat(events): add basic event handler to collect application events

[lsampras]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Adding an events scaffolding to collect/export events from application
• This involves adding a trait to accept events which will then be logged to stdout loki
• This method would enforce the events schema while also enabling us to better search them on loki via labels

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

• Currently most of our analysis about the system happens via logs but apart from the different level of logs that we have setup, It would also benefit us from having a parallel set of logs that are more domain oriented
• These set of logs would target top level events
• We can store this in a separate stream in loki which would allow much efficient queries allowing one to search for events on a much longer range

How did you test it?

• I tested it with stdout logs

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable