core/hpke: reduce memory usage from zstd #4650
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Summary
Based on https://pkg.go.dev/tailscale.com/smallzstd we can use a smaller window size and some options to reduce the memory usage for zstd.
Re-using the encoder and decoder appears to be supported based on the packages documentation. The defaults are not a memory leak, but they do use a lot of memory since they are optimized for large payloads.
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Checklist
improvement/bug/ etc)