[CH-419] support map type for JSONExtract and fix bugs for explode/posexplode #421
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
support map type for JSONExtract and fix bugs for explode/posexplode
close issues:
Notice: some commits are cherry picked from pr ClickHouse#48629. Let's wait until it is merged. @liuneng1994