[CH-419] support map type for JSONExtract and fix bugs for explode/posexplode

[taiyang-li]

Changelog category (leave one):

• New Feature

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:

• https://github.com/Kyligence/ClickHouse/issues/419
• https://github.com/Kyligence/ClickHouse/issues/412

Notice: some commits are cherry picked from pr https://github.com/ClickHouse/ClickHouse/pull/48629. Let's wait until it is merged. @liuneng1994

[kyligence-git]

Can one of the admins verify this patch?