Add chdb in-process backend via interface="chdb"#753

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wudidapaopao wants to merge 8 commits into

ClickHouse:mainfrom

wudidapaopao:feat/chdb-backend

Commits on May 21, 2026

Add chdb in-process backend via interface="chdb"
wudidapaopao
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Drop sys_platform marker on chdb extra so Windows fails at install time
wudidapaopao
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Drop chdb DataFrame fast path and clean up dead code
wudidapaopao
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Restore chdb session settings after command() per-call overrides
wudidapaopao
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Add CHANGELOG entry for chdb backend
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Wire chdb parameter binding and expand test coverage
wudidapaopao
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Add chdb tests for arrow/numpy/streaming/DBAPI parity with HTTP
wudidapaopao
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Fix chdb backend bugs and behavior gaps found via HTTP integration test parity
wudidapaopao
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