[WIP]: add v8.5.5 release notes#22190

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qiancai wants to merge 44 commits intopingcap:masterfrom

qiancai:add-8.5.5-rn

Commits on Dec 16, 2025

Create release-8.5.5.md
qiancai
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Commits on Dec 17, 2025

Commits on Dec 18, 2025

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hfxsd
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Commits on Dec 29, 2025

Commits on Dec 30, 2025

Commits on Dec 31, 2025

Compatibility changes: add tidb_index_lookup_pushdown_policy
Oreoxmt
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add improvements and bug fixes for coprocessor/TiKV /engine/raft

qiancai
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hbisheng
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Commits on Jan 6, 2026

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benmeadowcroft
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lilin90
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Commits on Jan 7, 2026