Sentry Error Monitoring Integration

[Adedayo-Data]

Closes #47

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Overview

This PR integrates Sentry (@sentry/node and @sentry/profiling-node) into the Vesting Vault backend to provide production-grade error monitoring and performance profiling. It specifically addresses the issue of silent crashes within the indexing service.

Changes Made Includes:

1. Core Integration: Initialized Sentry in index.js with environment-based configuration (Production vs. Staging tags).

2. Enhanced Error Context:

    - Wrapped processClaim to capture exceptions with full claimData (transaction hashes, token addresses, etc.) for easier debugging.

    - Integrated Sentry into processBatchClaims to ensure individual transaction failures are reported even if the batch continues.

    - Added instrumentation to processTopUpEvent, processReleaseEvent, backfillMissingPrices, and getRealizedGains.

3. Resilience: Updated catch blocks to prevent silent failures, ensuring stack traces are preserved and reported.

How to Test

- Set SENTRY_DSN in your .env file.

- Run the application and trigger a malformed claim via the /api/claims endpoint.

- Verify that the error appears in your Sentry dashboard with the associated transaction metadata.