Align HiSparse with KV connector lifecycle
Move HiSparse into its own v1 package, split scheduler and worker responsibilities, and carry worker commands through standard connector metadata. Keep ActiveKVConnector generic while preserving the post-forward spill and CUDA graph reset lifecycle.
Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>