feat: sink panic and send timeout

[luiseterc]

Changes Made:

1. Panic Recovery: Added a defer function that recovers from panics in sink operations, logs the error, properly closes the sink, and ensures the WaitGroup is decremented to prevent deadlocks.
2. Timeout Protection :

• Added a 30-second timeout constant for all sink Send operations
• Each Send call now uses context.WithTimeout to prevent indefinite blocking
• Timeout errors are logged at ERROR level with timeout duration for visibility
• Context is always cancelled after Send to prevent resource leaks

These improvements ensure that:

• If a sink panics, it won't crash the entire exporter
• If a sink hangs, it will timeout after 30 seconds instead of blocking forever
• Both scenarios are properly logged for debugging
• The exporter continues processing events even when individual sinks fail

Fixes #8