### The Feature

Support rotating the salt_key, similar to the existing <https://docs.litellm.ai/docs/proxy/master_key_rotations>

### Motivation, pitch

If you have litellm running in production, and enable debug logging while investigating an issue, your master_key and salt_key will be leaked in the _alerting_callbacks log. While master_key can be rotated, there doesn't seem to be a way to rotate the salt_key which I consider necessary since they've both been exposed now.