feat: external-table feature series + MySQL SQLSTATEs [port to 4.2-dev of #27489, #27531, #27517, #27710, #27611] - #27769

feat: external-table feature series + MySQL SQLSTATEs [port to 4.2-dev of #27489, #27531, #27517, #27710, #27611]#27769

fengttt merged 9 commits into

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