fix(adapter): add retry logic for redis psubscribe timeout

[anushka1822]

Problem

In distributed environments, the Redis handshake can fail due to temporary network timeouts, causing the adapter to crash on initialization.

Solution

Implemented a retry mechanism with exponential backoff for the psubscribe call (and pSubscribe for Redis v4).

• Max Retries: 3
• Backoff: 100ms, 200ms, 300ms.
• Failover: Emits an 'error' event after 3 failed attempts instead of crashing.

Changes

1. lib/index.ts: Added withRetry helper method and wrapped subscription logic.
2. test/adapter-retries.ts: Added unit tests using Mocha/Sinon to verify retry counts.
3. tsconfig.json: Updated to include test/**/* and enabled esModuleInterop for testing compatibility.

Verification

Tests pass locally:

• ✔ should retry psubscribe call
• ✔ should retry pSubscribe call (Redis v4)