Add Performance and Load Testing for Rate Limiting Algorithms

[neelp03]

Description:
Conduct performance and load testing for the Fixed Window, Sliding Window, and Token Bucket algorithms in ThrottleX. Ensure that rate-limiting performance is acceptable under high throughput.

Acceptance Criteria:

• Add benchmark tests using Go's testing package.
• Measure latency, request throughput, and memory usage.
• Provide performance reports for each algorithm under load.