[Feature]: Use deterministic hashing for KV events always

[PeaBrane]

🚀 The feature, motivation and pitch

Motivation

My understanding is that the KV events are mainly used to interface with the NVIDIA Dynamo framework, whose KvIndexer would always expect the external sequence hashes emitted by the engines to be consistent across backend engine processes. Therefore, it would probably make sense to always use SHA-256 hashing (or default to it) if the overhead is acceptable

Pitch

Always use SHA-256 hashing so the user does not need to set a fixed seed in the env var or set the --prefix-caching-algo sha256 flag, as done here, which would mean the flag would be deprecated as well.

Alternatives

No response

Additional context

No response

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