feat: adds a pointservice

[ckartik]

Add Points Accrual Service with Event Subscription, API Endpoints, and Initial SQLite DB

Summary

• Introduces the PointsService managing a periodic points accrual routine (StartPointsRoutine) and event subscription for validator opt-ins/opt-outs.
• Provides an HTTP API (PointsAPI) for querying points totals and block info.
• Implements a basic SQLite data model with validator_records and last_processed_block tables, plus unit tests for computePointsForMonths.

Next Steps

• Migrate the DB layer from SQLite to Postgres.
• Move the service into our production infrastructure codebase, ensuring proper configuration (e.g., environment variables, container orchestration, etc.).

[aloknerurkar]

Apart from the nit picks LGTM!

I would still be more comfortable if someone else also takes a look, make sure I havent missed anything. Maybe @shaspitz

[ckartik]

We've scaled down 10x and changed the curve shape of accrued points.