feat: support DISCARD ALL command and add npgsql client test #16432
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What's changed and what's your intention?
DISCARD ALLandpg_range(#16425) are all the missing features for the Npgsql support.This improvement is based on #10177
Checklist
./risedev check(or alias,./risedev c)Documentation
This PR introduces a new command
DISCARD ALLto address the compatibility issue with Npgsql, a C# Postgres client library. I tested the connection and provided a few demo code that can be used for documentation.NOTE: Npgsql 8+ requires specifying
ServerCompatibilityMode=NoTypeLoadingin the connection string. Npgsql 7+ doesn't have this problem.Verfied version matrix
Release note
If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.