perf: Add debouncing to Redis metrics collection

[smoreinis]

Summary

• Add 30-second debounce interval for send_redis_connection_metrics()
• Remove duplicate metrics call after xadd (was calling twice per send_data)
• Use time.monotonic() for reliable time tracking

Problem

send_redis_connection_metrics() was called twice per send_data() call, and on every stream operation. Each call executes redis.info() which is expensive.

Benchmark Results

Metric	Old (2x info per op)	New (debounced)	Improvement
100 send_data() calls	196ms	48ms	4.1x faster
Per-operation latency	1.96ms	0.48ms	-1.48ms
redis.info() calls	200	1	99.5% reduction

How to Verify

# Monitor Redis INFO commands
redis-cli MONITOR | grep -i info

# Before: See INFO twice per stream operation
# After: See INFO at most once per 30 seconds

Files Changed

• src/adapters/streams/adapter_redis.py