Implement API Key Rotation Mechanism

[mrubens]

From @JuliusMa in #75:

Introduce a feature to automatically rotate through multiple API keys to handle rate limits, improve reliability, and ensure uninterrupted service.

(I deeply appreciate your efforts and the value you’ve brought. A real lifesaver in the world of buggy WS and other. Thank you for everything.)

[mrubens]

Just noticed #194 - let's consolidate there