netty: Increase HPACK encoder bucket count to 128 - #13077
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Increase the HPACK encoder bucket count from 16 to 128 for both clients and servers. Netty 4.1.138/4.2.18 limits encoder tables to
bucket count × 64when processing a peer's table-size setting, so this allows up to 8 KiB within the peer's advertised limit. Advertised table sizes and the Netty dependency version are unchanged.Separate JMH benchmark and results: at the same 4 KiB capacity, 128 buckets reduced synthetic mixed-header processing time by 24–28%, with unchanged per-request allocation and encoded size. Encoder construction allocated an additional 896 bytes with compressed references.
Related to #12973. Discovered by @ejona86.