Prevent cache expiration with claude!

Requesting this feature, cache pings like Aider does, Aider saves me a TON of money with this method, please implement it.

"Preventing cache expiration

Aider can ping the provider to keep your prompt cache warm and prevent it from expiring. By default, Anthropic keeps your cache for 5 minutes. Use --cache-keepalive-pings N to tell aider to ping every 5 minutes to keep the cache warm. Aider will ping up to N times over a period of N*5 minutes after each message you send."

https://aider.chat/docs/usage/caching.html