support for PREPARE and EXECUTE statement#298

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TwistingTwists wants to merge 11 commits intodatafusion-contrib:masterfrom

TwistingTwists:feat/prepare-execute

Commits on Feb 24, 2026

chore: switch pgwire to local path dependency for testing

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feat: add PREPARE statement handling in simple query

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feat: implement PREPARE/EXECUTE/DEALLOCATE as QueryHook
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feat: implement parameter substitution in EXECUTE statements
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tests: add DEALLOCATE ALL and parameter tests
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feat: add parameter type validation and wire protocol interoperability tests
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chore: use remote pgwire dependency from crates.io
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chore: remove unused clone_statements method
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chore: remove docs/ working notes
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fix: isolate prepared statements per session and use client metadata for EXECUTE
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chore: remove "Regression test for P1" comments from tests
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