Add connection pool configuration for HTTP requests

[meshackyaro]

Description

HTTP connection pooling not configurable leading to connection exhaustion under high load.

Component

SDK

Difficulty

🟡 Medium

Tasks

• Add connection pool configuration
• Implement connection reuse
• Add keepAlive support
• Configure pool size limits
• Test under high concurrency

Acceptance Criteria

• Connection pool configurable
• Connections reused efficiently
• No connection exhaustion

Estimated Time

2 days